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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
#ifndef RENDERER_UTILS_H
#define RENDERER_UTILS_H
namespace SampleRenderer
{
class safe_bool_base
{
protected:
typedef void (safe_bool_base::*bool_type)() const;
void this_type_does_not_support_comparisons() const {}
safe_bool_base() {}
safe_bool_base(const safe_bool_base&) {}
safe_bool_base& operator=(const safe_bool_base&) {return *this;}
~safe_bool_base() {}
};
template <typename T=void> class safe_bool : public safe_bool_base
{
public:
operator bool_type() const
{
return (static_cast<const T*>(this))->boolean_test() ?
//&safe_bool_base::this_type_does_not_support_comparisons : 0;
&safe_bool<T>::this_type_does_not_support_comparisons : 0;
}
protected:
~safe_bool() {}
};
template<> class safe_bool<void> : public safe_bool_base
{
public:
operator bool_type() const
{
return boolean_test()==true ?
//&safe_bool_base::this_type_does_not_support_comparisons : 0;
&safe_bool<void>::this_type_does_not_support_comparisons : 0;
}
protected:
virtual bool boolean_test() const=0;
virtual ~safe_bool() {}
};
template <typename T, typename U>
PX_INLINE bool operator==(const safe_bool<T>& lhs,const safe_bool<U>& rhs)
{
lhs.this_type_does_not_support_comparisons();
return false;
}
template <typename T,typename U>
PX_INLINE bool operator!=(const safe_bool<T>& lhs,const safe_bool<U>& rhs)
{
lhs.this_type_does_not_support_comparisons();
return false;
}
}
#endif
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