mirror of
https://github.com/microsoft/GSL.git
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115 lines
3.0 KiB
C++
115 lines
3.0 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_CONTRACTS_H
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#define GSL_CONTRACTS_H
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#include <exception>
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#include <stdexcept>
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#ifdef _MSC_VER
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// MSVC 2013 workarounds
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#if _MSC_VER <= 1800
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// noexcept is not understood
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#pragma push_macro("noexcept")
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#define noexcept
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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//
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// There are three configuration options for this GSL implementation's behavior
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// when pre/post conditions on the GSL types are violated:
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//
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// 1. GSL_TERMINATE_ON_CONTRACT_VIOLATION: std::terminate will be called (default)
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// 2. GSL_THROW_ON_CONTRACT_VIOLATION: a gsl::fail_fast exception will be thrown
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// 3. GSL_UNENFORCED_ON_CONTRACT_VIOLATION: nothing happens
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//
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#if !(defined(GSL_THROW_ON_CONTRACT_VIOLATION) ^ defined(GSL_TERMINATE_ON_CONTRACT_VIOLATION) ^ defined(GSL_UNENFORCED_ON_CONTRACT_VIOLATION))
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#define GSL_TERMINATE_ON_CONTRACT_VIOLATION
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#endif
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#define GSL_STRINGIFY_DETAIL(x) #x
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#define GSL_STRINGIFY(x) GSL_STRINGIFY_DETAIL(x)
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//
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// GSL.assert: assertions
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//
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namespace gsl
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{
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struct fail_fast
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{
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virtual char const* what() const noexcept = 0;
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};
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namespace details
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{
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template<typename E>
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struct contract_violation : public E, public fail_fast
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{
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explicit contract_violation(char const* const message) : E(message) {}
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virtual char const* what() const noexcept override
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{
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return E::what();
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}
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};
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}
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}
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#if defined(GSL_THROW_ON_CONTRACT_VIOLATION)
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#define Expects(cond) if (!(cond)) \
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throw gsl::details::contract_violation<std::logic_error>("GSL: Precondition failure at " __FILE__ ": " GSL_STRINGIFY(__LINE__));
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#define Ensures(cond) if (!(cond)) \
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throw gsl::details::contract_violation<std::runtime_error>("GSL: Postcondition failure at " __FILE__ ": " GSL_STRINGIFY(__LINE__));
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#elif defined(GSL_TERMINATE_ON_CONTRACT_VIOLATION)
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#define Expects(cond) if (!(cond)) std::terminate();
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#define Ensures(cond) if (!(cond)) std::terminate();
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#elif defined(GSL_UNENFORCED_ON_CONTRACT_VIOLATION)
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#define Expects(cond)
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#define Ensures(cond)
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#endif
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#ifdef _MSC_VER
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#if _MSC_VER <= 1800
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#undef noexcept
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#pragma pop_macro("noexcept")
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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#endif // GSL_CONTRACTS_H
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