diff options
Diffstat (limited to 'include/llvm/Support/Compiler.h')
| -rw-r--r-- | include/llvm/Support/Compiler.h | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h index 5acc7160ab..fce30e8b7d 100644 --- a/include/llvm/Support/Compiler.h +++ b/include/llvm/Support/Compiler.h @@ -19,25 +19,47 @@ # define __has_feature(x) 0 #endif -/// LLVM_HAS_RVALUE_REFERENCES - Does the compiler provide r-value references? +/// \brief Does the compiler support r-value references? /// This implies that <utility> provides the one-argument std::move; it /// does not imply the existence of any other C++ library features. #if (__has_feature(cxx_rvalue_references) \ || defined(__GXX_EXPERIMENTAL_CXX0X__) \ || (defined(_MSC_VER) && _MSC_VER >= 1600)) -#define LLVM_USE_RVALUE_REFERENCES 1 +#define LLVM_HAS_RVALUE_REFERENCES 1 #else -#define LLVM_USE_RVALUE_REFERENCES 0 +#define LLVM_HAS_RVALUE_REFERENCES 0 +#endif + +/// \brief Does the compiler support r-value reference *this? +/// +/// Sadly, this is separate from just r-value reference support because GCC +/// implemented everything but this thus far. No release of GCC yet has support +/// for this feature so it is enabled with Clang only. +/// FIXME: This should change to a version check when GCC grows support for it. +#if __has_feature(cxx_rvalue_references) +#define LLVM_HAS_RVALUE_REFERENCE_THIS 1 +#else +#define LLVM_HAS_RVALUE_REFERENCE_THIS 0 #endif /// llvm_move - Expands to ::std::move if the compiler supports /// r-value references; otherwise, expands to the argument. -#if LLVM_USE_RVALUE_REFERENCES +#if LLVM_HAS_RVALUE_REFERENCES #define llvm_move(value) (::std::move(value)) #else #define llvm_move(value) (value) #endif +/// Expands to '&' if r-value references are supported. +/// +/// This can be used to provide l-value/r-value overrides of member functions. +/// The r-value override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS +#if LLVM_HAS_RVALUE_REFERENCE_THIS +#define LLVM_LVALUE_FUNCTION & +#else +#define LLVM_LVALUE_FUNCTION +#endif + /// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it. /// Use to mark functions as uncallable. Member functions with this should /// be declared private so that some behavior is kept in C++03 mode. |