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72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GSL_FINAL_ACTION_H
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#define GSL_FINAL_ACTION_H
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#ifdef _MSC_VER
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// VS 2013 workarounds
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#if _MSC_VER <= 1800
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// noexcept is not understood
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#define noexcept /* nothing */
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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namespace gsl
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{
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//
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// GSL.util: Utilities
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//////////////////////
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// This component is a `gsl` utility that allows you to ensure that an act
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// gets performed at the end of a scope
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template <class F>
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class final_action
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{
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public:
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explicit final_action(F f) noexcept : f_(std::move(f)), invoke_(true) {}
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final_action(final_action&& other) noexcept : f_(std::move(other.f_)), invoke_(true) { other.invoke_ = false; }
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~final_action() noexcept { if (invoke_) f_(); }
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private:
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final_action(const final_action&) = delete;
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final_action& operator=(const final_action&) = delete;
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private:
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F f_;
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bool invoke_;
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};
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//
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// Function name: finally
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//
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// This is a convenience function to generate a final_action
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//
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template <class F>
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final_action<F> finally(const F& f) noexcept { return final_action<F>(f); }
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template <class F>
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final_action<F> finally(F&& f) noexcept { return final_action<F>(std::forward<F>(f)); }
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} // close namespace gsl
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#endif // GSL_FINAL_ACTION_H
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