GSL/include/fail_fast.h

///////////////////////////////////////////////////////////////////////////////
//
// 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_FAIL_FAST_H
#define GSL_FAIL_FAST_H

#include <exception>
#include <stdexcept>

namespace gsl
{

//
// Having "fail fast" result in an exception makes unit testing
// the GSL classes that rely upon it much simpler.
//
#if defined(GSL_THROWS_FOR_TESTING)

struct fail_fast : public std::runtime_error
{
    fail_fast() : std::runtime_error("")
    {
    }
    explicit fail_fast(char const* const message) : std::runtime_error(message)
    {
    }
};

inline void fail_fast_assert(bool cond)
{
    if (!cond) throw fail_fast();
}
inline void fail_fast_assert(bool cond, const char* const message)
{
    if (!cond) throw fail_fast(message);
}

#else

inline void fail_fast_assert(bool cond)
{
    if (!cond) std::terminate();
}
inline void fail_fast_assert(bool cond, const char* const)
{
    if (!cond) std::terminate();
}

#endif // GSL_THROWS_FOR_TESTING
}

#endif // GSL_FAIL_FAST_H