91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
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#ifndef RENDERER_UTILS_H
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#define RENDERER_UTILS_H
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namespace SampleRenderer
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{
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class safe_bool_base
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{
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protected:
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typedef void (safe_bool_base::*bool_type)() const;
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void this_type_does_not_support_comparisons() const {}
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safe_bool_base() {}
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safe_bool_base(const safe_bool_base&) {}
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safe_bool_base& operator=(const safe_bool_base&) {return *this;}
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~safe_bool_base() {}
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};
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template <typename T=void> class safe_bool : public safe_bool_base
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{
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public:
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operator bool_type() const
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{
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return (static_cast<const T*>(this))->boolean_test() ?
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//&safe_bool_base::this_type_does_not_support_comparisons : 0;
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&safe_bool<T>::this_type_does_not_support_comparisons : 0;
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}
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protected:
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~safe_bool() {}
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};
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template<> class safe_bool<void> : public safe_bool_base
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{
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public:
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operator bool_type() const
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{
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return boolean_test()==true ?
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//&safe_bool_base::this_type_does_not_support_comparisons : 0;
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&safe_bool<void>::this_type_does_not_support_comparisons : 0;
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}
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protected:
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virtual bool boolean_test() const=0;
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virtual ~safe_bool() {}
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};
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template <typename T, typename U>
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PX_INLINE bool operator==(const safe_bool<T>& lhs,const safe_bool<U>& rhs)
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{
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lhs.this_type_does_not_support_comparisons();
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return false;
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}
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template <typename T,typename U>
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PX_INLINE bool operator!=(const safe_bool<T>& lhs,const safe_bool<U>& rhs)
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{
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lhs.this_type_does_not_support_comparisons();
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return false;
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}
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}
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#endif
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