63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <exception>
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namespace folly {
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namespace detail {
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// thunk
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//
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// A carefully curated collection of generic general-purpose thunk templates:
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// * make: operator new with given arguments
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// * ruin: operator delete
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// * ctor: in-place constructor with given arguments
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// * dtor: in-place destructor
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// * noop: no-op function with the given arguments
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// * fail: terminating function with the given return and arguments
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struct thunk {
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template <typename T, typename... A>
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static void* make(A... a) {
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return new T(static_cast<A>(a)...);
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}
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template <typename T>
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static void ruin(void* const ptr) noexcept {
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delete static_cast<T*>(ptr);
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}
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template <typename T, typename... A>
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static void ctor(void* const ptr, A... a) {
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::new (ptr) T(static_cast<A>(a)...);
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}
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template <typename T>
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static void dtor(void* const ptr) noexcept {
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static_cast<T*>(ptr)->~T();
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}
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template <typename... A>
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static void noop(A...) noexcept {}
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template <typename R, typename... A>
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static R fail(A...) noexcept {
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std::terminate();
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}
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};
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} // namespace detail
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} // namespace folly
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