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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#pragma once
#ifndef GSL_CONTRACTS_H
#define GSL_CONTRACTS_H
#include <exception>
#include <stdexcept>
//
// There are three configuration options for this GSL implementation's behavior
// when pre/post conditions on the GSL types are violated:
//
// 1. GSL_TERMINATE_ON_CONTRACT_VIOLATION: std::terminate will be called (default)
// 2. GSL_THROW_ON_CONTRACT_VIOLATION: a gsl::fail_fast exception will be thrown
// 3. GSL_UNENFORCED_ON_CONTRACT_VIOLATION: nothing happens
//
#if !(defined(GSL_THROW_ON_CONTRACT_VIOLATION) ^ defined(GSL_TERMINATE_ON_CONTRACT_VIOLATION) ^ \
defined(GSL_UNENFORCED_ON_CONTRACT_VIOLATION))
#define GSL_TERMINATE_ON_CONTRACT_VIOLATION
#endif
#define GSL_STRINGIFY_DETAIL(x) #x
#define GSL_STRINGIFY(x) GSL_STRINGIFY_DETAIL(x)
#if defined(__clang__) || defined(__GNUC__)
#define GSL_LIKELY(x) __builtin_expect (!!(x), 1)
#define GSL_UNLIKELY(x) __builtin_expect (!!(x), 0)
#else
#define GSL_LIKELY(x) (x)
#define GSL_UNLIKELY(x) (x)
#endif
//
// GSL.assert: assertions
//
namespace gsl
{
struct fail_fast : public std::runtime_error
{
explicit fail_fast(char const* const message) : std::runtime_error(message) {}
};
}
#if defined(GSL_THROW_ON_CONTRACT_VIOLATION)
#define Expects(cond) \
if (GSL_UNLIKELY(!(cond))) \
throw gsl::fail_fast("GSL: Precondition failure at " __FILE__ ": " GSL_STRINGIFY(__LINE__));
#define Ensures(cond) \
if (GSL_UNLIKELY(!(cond))) \
throw gsl::fail_fast("GSL: Postcondition failure at " __FILE__ \
": " GSL_STRINGIFY(__LINE__));
#elif defined(GSL_TERMINATE_ON_CONTRACT_VIOLATION)
#define Expects(cond) \
if (GSL_UNLIKELY(!(cond))) std::terminate();
#define Ensures(cond) \
if (GSL_UNLIKELY(!(cond))) std::terminate();
#elif defined(GSL_UNENFORCED_ON_CONTRACT_VIOLATION)
#define Expects(cond)
#define Ensures(cond)
#endif
#endif // GSL_CONTRACTS_H
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