677 lines
25 KiB
C++
677 lines
25 KiB
C++
// Copyright (C) 2019 T. Zachary Laine
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_STL_INTERFACES_CONTAINER_INTERFACE_HPP
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#define BOOST_STL_INTERFACES_CONTAINER_INTERFACE_HPP
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#include <boost/stl_interfaces/reverse_iterator.hpp>
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#include <boost/assert.hpp>
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#include <boost/config.hpp>
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#include <algorithm>
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#include <stdexcept>
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#include <cstddef>
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namespace boost { namespace stl_interfaces { namespace detail {
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template<typename T, typename SizeType>
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struct n_iter : iterator_interface<
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n_iter<T, SizeType>,
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std::random_access_iterator_tag,
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T>
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{
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n_iter() : x_(nullptr), n_(0) {}
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n_iter(T const & x, SizeType n) : x_(&x), n_(n) {}
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constexpr std::ptrdiff_t operator-(n_iter other) const noexcept
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{
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return std::ptrdiff_t(n_) - std::ptrdiff_t(other.n_);
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}
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n_iter & operator+=(std::ptrdiff_t offset)
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{
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n_ += offset;
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return *this;
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}
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private:
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friend access;
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constexpr T const *& base_reference() noexcept { return x_; }
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constexpr T const * base_reference() const noexcept { return x_; }
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T const * x_;
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SizeType n_;
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};
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template<typename T, typename SizeType>
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constexpr auto make_n_iter(T const & x, SizeType n) noexcept(
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noexcept(n_iter<T, SizeType>(x, n)))
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{
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using result_type = n_iter<T, SizeType>;
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return result_type(x, SizeType(0));
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}
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template<typename T, typename SizeType>
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constexpr auto make_n_iter_end(T const & x, SizeType n) noexcept(
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noexcept(n_iter<T, SizeType>(x, n)))
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{
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return n_iter<T, SizeType>(x, n);
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}
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template<typename Container>
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std::size_t fake_capacity(Container const & c)
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{
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return SIZE_MAX;
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}
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template<
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typename Container,
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typename Enable = decltype(
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std::size_t() = std::declval<Container const &>().capacity())>
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std::size_t fake_capacity(Container const & c)
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{
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return c.capacity();
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}
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}}}
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namespace boost { namespace stl_interfaces { inline namespace v1 {
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/** A CRTP template that one may derive from to make it easier to define
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container types.
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The template parameter `D` for `sequence_container_interface` may be
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an incomplete type. Before any member of the resulting specialization
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of `sequence_container_interface` other than special member functions
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is referenced, `D` shall be complete; shall model
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`std::derived_from<sequence_container_interface<D>>`,
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`std::semiregular`, and `std::forward_range`; and shall contain all
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the nested types required in Table 72: Container requirements and, for
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those whose iterator nested type models `std::bidirectinal_iterator`,
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those in Table 73: Reversible container requirements.
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For an object `d` of type `D`, a call to `std::ranges::begin(d)` sxhall
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not mutate any data members of `d`, and `d`'s destructor shall end the
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lifetimes of the objects in `[std::ranges::begin(d),
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std::ranges::end(d))`. */
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template<
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typename Derived,
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element_layout Contiguity = element_layout::discontiguous
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#ifndef BOOST_STL_INTERFACES_DOXYGEN
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,
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typename E = std::enable_if_t<
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std::is_class<Derived>::value &&
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std::is_same<Derived, std::remove_cv_t<Derived>>::value>
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#endif
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>
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struct sequence_container_interface;
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namespace v1_dtl {
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template<typename Iter>
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using in_iter = std::is_convertible<
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typename std::iterator_traits<Iter>::iterator_category,
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std::input_iterator_tag>;
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template<typename D, typename = void>
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struct clear_impl
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{
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static constexpr void call(D & d) noexcept {}
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};
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template<typename D>
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struct clear_impl<D, void_t<decltype(std::declval<D>().clear())>>
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{
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static constexpr void call(D & d) noexcept { d.clear(); }
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};
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template<typename D, element_layout Contiguity>
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void derived_container(sequence_container_interface<D, Contiguity> const &);
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}
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template<
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typename Derived,
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element_layout Contiguity
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#ifndef BOOST_STL_INTERFACES_DOXYGEN
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,
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typename E
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#endif
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>
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struct sequence_container_interface
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{
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#ifndef BOOST_STL_INTERFACES_DOXYGEN
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private:
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constexpr Derived & derived() noexcept
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{
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return static_cast<Derived &>(*this);
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}
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constexpr const Derived & derived() const noexcept
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{
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return static_cast<Derived const &>(*this);
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}
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constexpr Derived & mutable_derived() const noexcept
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{
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return const_cast<Derived &>(static_cast<Derived const &>(*this));
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}
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#endif
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public:
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template<typename D = Derived>
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constexpr auto empty() noexcept(
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noexcept(std::declval<D &>().begin() == std::declval<D &>().end()))
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-> decltype(
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std::declval<D &>().begin() == std::declval<D &>().end())
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{
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return derived().begin() == derived().end();
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}
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template<typename D = Derived>
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constexpr auto empty() const noexcept(noexcept(
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std::declval<D const &>().begin() ==
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std::declval<D const &>().end()))
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-> decltype(
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std::declval<D const &>().begin() ==
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std::declval<D const &>().end())
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{
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return derived().begin() == derived().end();
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}
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template<
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typename D = Derived,
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element_layout C = Contiguity,
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typename Enable = std::enable_if_t<C == element_layout::contiguous>>
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constexpr auto data() noexcept(noexcept(std::declval<D &>().begin()))
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-> decltype(std::addressof(*std::declval<D &>().begin()))
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{
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return std::addressof(*derived().begin());
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}
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template<
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typename D = Derived,
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element_layout C = Contiguity,
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typename Enable = std::enable_if_t<C == element_layout::contiguous>>
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constexpr auto data() const
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noexcept(noexcept(std::declval<D const &>().begin()))
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-> decltype(std::addressof(*std::declval<D const &>().begin()))
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{
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return std::addressof(*derived().begin());
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}
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template<typename D = Derived>
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constexpr auto size()
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#if !BOOST_CLANG
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noexcept(noexcept(
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std::declval<D &>().end() - std::declval<D &>().begin()))
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#endif
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-> decltype(typename D::size_type(
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std::declval<D &>().end() - std::declval<D &>().begin()))
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{
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return derived().end() - derived().begin();
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}
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template<typename D = Derived>
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constexpr auto size() const noexcept(noexcept(
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std::declval<D const &>().end() -
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std::declval<D const &>().begin()))
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-> decltype(typename D::size_type(
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#if !BOOST_CLANG
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std::declval<D const &>().end() -
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std::declval<D const &>().begin()
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#endif
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))
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{
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return derived().end() - derived().begin();
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}
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template<typename D = Derived>
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constexpr auto front() noexcept(noexcept(*std::declval<D &>().begin()))
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-> decltype(*std::declval<D &>().begin())
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{
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return *derived().begin();
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}
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template<typename D = Derived>
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constexpr auto front() const
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noexcept(noexcept(*std::declval<D const &>().begin()))
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-> decltype(*std::declval<D const &>().begin())
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{
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return *derived().begin();
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}
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template<typename D = Derived>
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constexpr auto push_front(typename D::value_type const & x) noexcept(
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noexcept(std::declval<D &>().emplace_front(x)))
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-> decltype((void)std::declval<D &>().emplace_front(x))
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{
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derived().emplace_front(x);
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}
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template<typename D = Derived>
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constexpr auto push_front(typename D::value_type && x) noexcept(
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noexcept(std::declval<D &>().emplace_front(std::move(x))))
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-> decltype((void)std::declval<D &>().emplace_front(std::move(x)))
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{
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derived().emplace_front(std::move(x));
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}
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template<typename D = Derived>
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constexpr auto pop_front() noexcept -> decltype(
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std::declval<D &>().emplace_front(
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std::declval<typename D::value_type &>()),
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(void)std::declval<D &>().erase(std::declval<D &>().begin()))
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{
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derived().erase(derived().begin());
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}
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template<
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typename D = Derived,
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typename Enable = std::enable_if_t<
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v1_dtl::decrementable_sentinel<D>::value &&
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v1_dtl::common_range<D>::value>>
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constexpr auto
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back() noexcept(noexcept(*std::prev(std::declval<D &>().end())))
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-> decltype(*std::prev(std::declval<D &>().end()))
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{
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return *std::prev(derived().end());
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}
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template<
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typename D = Derived,
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typename Enable = std::enable_if_t<
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v1_dtl::decrementable_sentinel<D>::value &&
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v1_dtl::common_range<D>::value>>
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constexpr auto back() const
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noexcept(noexcept(*std::prev(std::declval<D const &>().end())))
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-> decltype(*std::prev(std::declval<D const &>().end()))
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{
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return *std::prev(derived().end());
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}
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template<typename D = Derived>
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constexpr auto push_back(typename D::value_type const & x) noexcept(
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noexcept(std::declval<D &>().emplace_back(x)))
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-> decltype((void)std::declval<D &>().emplace_back(x))
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{
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derived().emplace_back(x);
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}
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template<typename D = Derived>
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constexpr auto push_back(typename D::value_type && x) noexcept(
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noexcept(std::declval<D &>().emplace_back(std::move(x))))
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-> decltype((void)std::declval<D &>().emplace_back(std::move(x)))
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{
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derived().emplace_back(std::move(x));
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}
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template<typename D = Derived>
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constexpr auto pop_back() noexcept -> decltype(
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std::declval<D &>().emplace_back(
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std::declval<typename D::value_type &>()),
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(void)std::declval<D &>().erase(
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std::prev(std::declval<D &>().end())))
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{
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derived().erase(std::prev(derived().end()));
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}
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template<typename D = Derived>
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constexpr auto operator[](typename D::size_type n) noexcept(
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noexcept(std::declval<D &>().begin()[n]))
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-> decltype(std::declval<D &>().begin()[n])
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{
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return derived().begin()[n];
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}
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template<typename D = Derived>
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constexpr auto operator[](typename D::size_type n) const
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noexcept(noexcept(std::declval<D const &>().begin()[n]))
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-> decltype(std::declval<D const &>().begin()[n])
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{
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return derived().begin()[n];
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}
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template<typename D = Derived>
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constexpr auto at(typename D::size_type i)
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-> decltype(std::declval<D &>().size(), std::declval<D &>()[i])
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{
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if (derived().size() <= i) {
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throw std::out_of_range(
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"Bounds check failed in sequence_container_interface::at()");
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}
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return derived()[i];
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}
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template<typename D = Derived>
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constexpr auto at(typename D::size_type i) const -> decltype(
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std::declval<D const &>().size(), std::declval<D const &>()[i])
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{
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if (derived().size() <= i) {
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throw std::out_of_range(
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"Bounds check failed in sequence_container_interface::at()");
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}
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return derived()[i];
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}
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template<typename D = Derived, typename Iter = typename D::const_iterator>
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constexpr Iter begin() const
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noexcept(noexcept(std::declval<D &>().begin()))
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{
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return Iter(mutable_derived().begin());
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}
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template<typename D = Derived, typename Iter = typename D::const_iterator>
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constexpr Iter end() const noexcept(noexcept(std::declval<D &>().end()))
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{
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return Iter(mutable_derived().end());
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}
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template<typename D = Derived>
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constexpr auto cbegin() const
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noexcept(noexcept(std::declval<D const &>().begin()))
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-> decltype(std::declval<D const &>().begin())
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{
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return derived().begin();
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}
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template<typename D = Derived>
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constexpr auto cend() const
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noexcept(noexcept(std::declval<D const &>().end()))
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-> decltype(std::declval<D const &>().end())
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{
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return derived().end();
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}
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template<
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typename D = Derived,
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typename Enable = std::enable_if_t<v1_dtl::common_range<D>::value>>
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constexpr auto rbegin() noexcept(noexcept(
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stl_interfaces::make_reverse_iterator(std::declval<D &>().end())))
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{
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return stl_interfaces::make_reverse_iterator(derived().end());
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}
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template<
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typename D = Derived,
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typename Enable = std::enable_if_t<v1_dtl::common_range<D>::value>>
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constexpr auto rend() noexcept(noexcept(
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stl_interfaces::make_reverse_iterator(std::declval<D &>().begin())))
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{
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return stl_interfaces::make_reverse_iterator(derived().begin());
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}
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template<typename D = Derived>
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constexpr auto rbegin() const
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noexcept(noexcept(std::declval<D &>().rbegin()))
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{
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return
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typename D::const_reverse_iterator(mutable_derived().rbegin());
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}
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template<typename D = Derived>
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constexpr auto rend() const
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noexcept(noexcept(std::declval<D &>().rend()))
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{
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return typename D::const_reverse_iterator(mutable_derived().rend());
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}
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template<typename D = Derived>
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constexpr auto crbegin() const
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noexcept(noexcept(std::declval<D const &>().rbegin()))
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-> decltype(std::declval<D const &>().rbegin())
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{
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return derived().rbegin();
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}
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template<typename D = Derived>
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constexpr auto crend() const
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noexcept(noexcept(std::declval<D const &>().rend()))
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-> decltype(std::declval<D const &>().rend())
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{
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return derived().rend();
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}
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template<typename D = Derived>
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constexpr auto insert(
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typename D::const_iterator pos,
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typename D::value_type const &
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x) noexcept(noexcept(std::declval<D &>().emplace(pos, x)))
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-> decltype(std::declval<D &>().emplace(pos, x))
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{
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return derived().emplace(pos, x);
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}
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template<typename D = Derived>
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constexpr auto insert(
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typename D::const_iterator pos,
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typename D::value_type &&
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x) noexcept(noexcept(std::declval<D &>()
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.emplace(pos, std::move(x))))
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-> decltype(std::declval<D &>().emplace(pos, std::move(x)))
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{
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return derived().emplace(pos, std::move(x));
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}
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template<typename D = Derived>
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constexpr auto insert(
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typename D::const_iterator pos,
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typename D::size_type n,
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typename D::value_type const & x)
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// If you see an error in this noexcept() expression, that's
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// because this function is not properly constrained. In other
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// words, Derived does not have a "range" insert like
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// insert(position, first, last). If that is the case, this
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// function should be removed via SFINAE from overload resolution.
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// However, both the trailing decltype code below and a
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// std::enable_if in the template parameters do not work. Sorry
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// about that. See below for details.
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noexcept(noexcept(std::declval<D &>().insert(
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pos, detail::make_n_iter(x, n), detail::make_n_iter_end(x, n))))
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// This causes the compiler to infinitely recurse into this function's
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// declaration, even though the call below does not match the
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// signature of this function.
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#if 0
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-> decltype(std::declval<D &>().insert(
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pos, detail::make_n_iter(x, n), detail::make_n_iter_end(x, n)))
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#endif
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{
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return derived().insert(
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pos, detail::make_n_iter(x, n), detail::make_n_iter_end(x, n));
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}
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template<typename D = Derived>
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constexpr auto insert(
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typename D::const_iterator pos,
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std::initializer_list<typename D::value_type>
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il) noexcept(noexcept(std::declval<D &>()
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.insert(pos, il.begin(), il.end())))
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-> decltype(std::declval<D &>().insert(pos, il.begin(), il.end()))
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{
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return derived().insert(pos, il.begin(), il.end());
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}
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template<typename D = Derived>
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constexpr auto erase(typename D::const_iterator pos) noexcept
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-> decltype(std::declval<D &>().erase(pos, std::next(pos)))
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{
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return derived().erase(pos, std::next(pos));
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}
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template<
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typename InputIterator,
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typename D = Derived,
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typename Enable =
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std::enable_if_t<v1_dtl::in_iter<InputIterator>::value>>
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constexpr auto assign(InputIterator first, InputIterator last) noexcept(
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noexcept(std::declval<D &>().insert(
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std::declval<D &>().begin(), first, last)))
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-> decltype(
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std::declval<D &>().erase(
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std::declval<D &>().begin(), std::declval<D &>().end()),
|
|
(void)std::declval<D &>().insert(
|
|
std::declval<D &>().begin(), first, last))
|
|
{
|
|
auto out = derived().begin();
|
|
auto const out_last = derived().end();
|
|
for (; out != out_last && first != last; ++first, ++out) {
|
|
*out = *first;
|
|
}
|
|
if (out != out_last)
|
|
derived().erase(out, out_last);
|
|
if (first != last)
|
|
derived().insert(derived().end(), first, last);
|
|
}
|
|
|
|
template<typename D = Derived>
|
|
constexpr auto assign(
|
|
typename D::size_type n,
|
|
typename D::value_type const &
|
|
x) noexcept(noexcept(std::declval<D &>()
|
|
.insert(
|
|
std::declval<D &>().begin(),
|
|
detail::make_n_iter(x, n),
|
|
detail::make_n_iter_end(x, n))))
|
|
-> decltype(
|
|
std::declval<D &>().size(),
|
|
std::declval<D &>().erase(
|
|
std::declval<D &>().begin(), std::declval<D &>().end()),
|
|
(void)std::declval<D &>().insert(
|
|
std::declval<D &>().begin(),
|
|
detail::make_n_iter(x, n),
|
|
detail::make_n_iter_end(x, n)))
|
|
{
|
|
if (detail::fake_capacity(derived()) < n) {
|
|
Derived temp(n, x);
|
|
derived().swap(temp);
|
|
} else {
|
|
auto const min_size =
|
|
std::min<std::ptrdiff_t>(n, derived().size());
|
|
auto const fill_end =
|
|
std::fill_n(derived().begin(), min_size, x);
|
|
if (min_size < (std::ptrdiff_t)derived().size()) {
|
|
derived().erase(fill_end, derived().end());
|
|
} else {
|
|
n -= min_size;
|
|
derived().insert(
|
|
derived().begin(),
|
|
detail::make_n_iter(x, n),
|
|
detail::make_n_iter_end(x, n));
|
|
}
|
|
}
|
|
}
|
|
|
|
template<typename D = Derived>
|
|
constexpr auto
|
|
assign(std::initializer_list<typename D::value_type> il) noexcept(
|
|
noexcept(std::declval<D &>().assign(il.begin(), il.end())))
|
|
-> decltype((void)std::declval<D &>().assign(il.begin(), il.end()))
|
|
{
|
|
derived().assign(il.begin(), il.end());
|
|
}
|
|
|
|
template<typename D = Derived>
|
|
constexpr auto
|
|
operator=(std::initializer_list<typename D::value_type> il) noexcept(
|
|
noexcept(std::declval<D &>().assign(il.begin(), il.end())))
|
|
-> decltype(
|
|
std::declval<D &>().assign(il.begin(), il.end()),
|
|
std::declval<D &>())
|
|
{
|
|
derived().assign(il.begin(), il.end());
|
|
return *this;
|
|
}
|
|
|
|
template<typename D = Derived>
|
|
constexpr auto clear() noexcept
|
|
-> decltype((void)std::declval<D &>().erase(
|
|
std::declval<D &>().begin(), std::declval<D &>().end()))
|
|
{
|
|
derived().erase(derived().begin(), derived().end());
|
|
}
|
|
};
|
|
|
|
/** Implementation of free function `swap()` for all containers derived
|
|
from `sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto swap(
|
|
ContainerInterface & lhs,
|
|
ContainerInterface & rhs) noexcept(noexcept(lhs.swap(rhs)))
|
|
-> decltype(v1_dtl::derived_container(lhs), lhs.swap(rhs))
|
|
{
|
|
return lhs.swap(rhs);
|
|
}
|
|
|
|
/** Implementation of `operator==()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto
|
|
operator==(ContainerInterface const & lhs, ContainerInterface const & rhs) noexcept(
|
|
noexcept(lhs.size() == rhs.size()) &&
|
|
noexcept(*lhs.begin() == *rhs.begin()))
|
|
-> decltype(
|
|
v1_dtl::derived_container(lhs),
|
|
lhs.size() == rhs.size(),
|
|
*lhs.begin() == *rhs.begin(),
|
|
true)
|
|
{
|
|
return lhs.size() == rhs.size() &&
|
|
std::equal(lhs.begin(), lhs.end(), rhs.begin());
|
|
}
|
|
|
|
/** Implementation of `operator!=()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto operator!=(
|
|
ContainerInterface const & lhs,
|
|
ContainerInterface const & rhs) noexcept(noexcept(lhs == rhs))
|
|
-> decltype(v1_dtl::derived_container(lhs), lhs == rhs)
|
|
{
|
|
return !(lhs == rhs);
|
|
}
|
|
|
|
/** Implementation of `operator<()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto operator<(
|
|
ContainerInterface const & lhs,
|
|
ContainerInterface const &
|
|
rhs) noexcept(noexcept(*lhs.begin() < *rhs.begin()))
|
|
-> decltype(
|
|
v1_dtl::derived_container(lhs), *lhs.begin() < *rhs.begin(), true)
|
|
{
|
|
auto it1 = lhs.begin();
|
|
auto const last1 = lhs.end();
|
|
auto it2 = rhs.begin();
|
|
auto const last2 = rhs.end();
|
|
for (; it1 != last1 && it2 != last2; ++it1, ++it2) {
|
|
if (*it1 < *it2)
|
|
return true;
|
|
if (*it2 < *it1)
|
|
return false;
|
|
}
|
|
return it1 == last1 && it2 != last2;
|
|
}
|
|
|
|
/** Implementation of `operator<=()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto operator<=(
|
|
ContainerInterface const & lhs,
|
|
ContainerInterface const & rhs) noexcept(noexcept(lhs < rhs))
|
|
-> decltype(v1_dtl::derived_container(lhs), lhs < rhs)
|
|
{
|
|
return !(rhs < lhs);
|
|
}
|
|
|
|
/** Implementation of `operator>()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto operator>(
|
|
ContainerInterface const & lhs,
|
|
ContainerInterface const & rhs) noexcept(noexcept(lhs < rhs))
|
|
-> decltype(v1_dtl::derived_container(lhs), lhs < rhs)
|
|
{
|
|
return rhs < lhs;
|
|
}
|
|
|
|
/** Implementation of `operator>=()` for all containers derived from
|
|
`sequence_container_interface`. */
|
|
template<typename ContainerInterface>
|
|
constexpr auto operator>=(
|
|
ContainerInterface const & lhs,
|
|
ContainerInterface const & rhs) noexcept(noexcept(lhs < rhs))
|
|
-> decltype(v1_dtl::derived_container(lhs), lhs < rhs)
|
|
{
|
|
return !(lhs < rhs);
|
|
}
|
|
|
|
}}}
|
|
|
|
#endif
|