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Diffstat (limited to 'LibOVR/Src/Kernel/OVR_Nullptr.h')
-rw-r--r-- | LibOVR/Src/Kernel/OVR_Nullptr.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/LibOVR/Src/Kernel/OVR_Nullptr.h b/LibOVR/Src/Kernel/OVR_Nullptr.h new file mode 100644 index 0000000..3fd0969 --- /dev/null +++ b/LibOVR/Src/Kernel/OVR_Nullptr.h @@ -0,0 +1,150 @@ +/************************************************************************************ + +PublicHeader: OVR_Kernel.h +Filename : OVR_Nullptr.h +Content : Implements C++11 nullptr for the case that the compiler doesn't. +Created : June 19, 2014 +Notes : + +Copyright : Copyright 2014 Oculus VR, Inc. All Rights reserved. + +Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); +you may not use the Oculus VR Rift SDK except in compliance with the License, +which is provided at the time of installation or download, or which +otherwise accompanies this software in either electronic or hard copy form. + +You may obtain a copy of the License at + +http://www.oculusvr.com/licenses/LICENSE-3.1 + +Unless required by applicable law or agreed to in writing, the Oculus VR SDK +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +************************************************************************************/ + +#ifndef OVR_Nullptr_h +#define OVR_Nullptr_h + +#pragma once + +#include "OVR_Types.h" + + +//----------------------------------------------------------------------------------- +// ***** OVR_HAVE_std_nullptr_t +// +// Identifies if <cstddef.h> includes std::nullptr_t. +// +#if !defined(OVR_HAVE_std_nullptr_t) && defined(OVR_CPP11_ENABLED) + #if defined(OVR_STDLIB_LIBCPP) + #define OVR_HAVE_std_nullptr_t 1 + #elif defined(OVR_STDLIB_LIBSTDCPP) + #if (__GLIBCXX__ >= 20110325) && (__GLIBCXX__ != 20110428) && (__GLIBCXX__ != 20120702) + #define OVR_HAVE_std_nullptr_t 1 + #endif + #elif defined(_MSC_VER) && (_MSC_VER >= 1600) // VS2010+ + #define OVR_HAVE_std_nullptr_t 1 + #elif defined(__clang__) + #define OVR_HAVE_std_nullptr_t 1 + #elif defined(OVR_CPP_GNUC) && (OVR_CPP_VERSION >= 406) // GCC 4.6+ + #define OVR_HAVE_std_nullptr_t 1 + #endif +#endif + + +//----------------------------------------------------------------------------------- +// ***** nullptr / std::nullptr_t +// +// Declares and defines nullptr and related types. +// +#if defined(OVR_CPP_NO_NULLPTR) + namespace std + { + class nullptr_t + { + public: + template <typename T> + operator T*() const + { return 0; } + + template <typename C, typename T> + operator T C::*() const + { return 0; } + + #if OVR_CPP_NO_EXPLICIT_CONVERSION_OPERATORS + typedef void* (nullptr_t::*bool_)() const; // 4.12,p1. We can't portably use operator bool(){ return false; } because bool + operator bool_() const // is convertable to int which breaks other required functionality. + { return false; } + #else + operator bool() const + { return false; } + #endif + + private: + void operator&() const; // 5.2.10,p9 + }; + + inline nullptr_t nullptr_get() + { + nullptr_t n = { }; + return n; + } + + #if !defined(nullptr) + #define nullptr nullptr_get() + #endif + + } // namespace std + + + // 5.9,p2 p4 + // 13.6, p13 + template <typename T> + inline bool operator==(T* pT, const std::nullptr_t) + { return pT == 0; } + + template <typename T> + inline bool operator==(const std::nullptr_t, T* pT) + { return pT == 0; } + + template <typename T, typename U> + inline bool operator==(const std::nullptr_t, T U::* pU) + { return pU == 0; } + + template <typename T, typename U> + inline bool operator==(T U::* pTU, const std::nullptr_t) + { return pTU == 0; } + + inline bool operator==(const std::nullptr_t, const std::nullptr_t) + { return true; } + + inline bool operator!=(const std::nullptr_t, const std::nullptr_t) + { return false; } + + inline bool operator<(const std::nullptr_t, const std::nullptr_t) + { return false; } + + inline bool operator<=(const std::nullptr_t, const std::nullptr_t) + { return true; } + + inline bool operator>(const std::nullptr_t, const std::nullptr_t) + { return false; } + + inline bool operator>=(const std::nullptr_t, const std::nullptr_t) + { return true; } + + using std::nullptr_t; + using std::nullptr_get; + +// Some compilers natively support C++11 nullptr but the standard library being used +// doesn't declare std::nullptr_t, in which case we provide one ourselves. +#elif !defined(OVR_HAVE_std_nullptr_t) && !defined(OVR_CPP_NO_DECLTYPE) + namespace std { typedef decltype(nullptr) nullptr_t; } +#endif + + +#endif + |