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ArrayRef: Add portability checks for constexpr.

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This commit is contained in:
Peter Johnson
2015-07-20 20:49:49 -07:00
parent 3cd3d1691e
commit 8bbe5f9fdb
1 changed files with 30 additions and 2 deletions
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32
include/llvm/ArrayRef.h
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@@ -16,6 +16,29 @@
#endif
#include <vector>
#ifndef LLVM_CONSTEXPR
# ifdef _MSC_VER
# if _MSC_VER >= 1900
# define LLVM_CONSTEXPR constexpr
# else
# define LLVM_CONSTEXPR
# endif
# elif defined(__has_feature)
# if __has_feature(cxx_constexpr)
# define LLVM_CONSTEXPR constexpr
# else
# define LLVM_CONSTEXPR
# endif
# elif defined(__GXX_EXPERIMENTAL_CXX0X__)
# define LLVM_CONSTEXPR constexpr
# elif defined(__has_constexpr)
# define LLVM_CONSTEXPR constexpr
# else
# define LLVM_CONSTEXPR
# endif
# define DEFINED_LLVM_CONSTEXPR
#endif
namespace llvm {
/// ArrayRef - Represent a constant reference to an array (0 or more elements
@@ -84,7 +107,7 @@ namespace llvm {
/// Construct an ArrayRef from a C array.
template <size_t N>
/*implicit*/ constexpr ArrayRef(const T (&Arr)[N])
/*implicit*/ LLVM_CONSTEXPR ArrayRef(const T (&Arr)[N])
: Data(Arr), Length(N) {}
/// Construct an ArrayRef from a std::initializer_list.
@@ -258,7 +281,7 @@ namespace llvm {
/// Construct an MutableArrayRef from a C array.
template <size_t N>
/*implicit*/ constexpr MutableArrayRef(T (&Arr)[N])
/*implicit*/ LLVM_CONSTEXPR MutableArrayRef(T (&Arr)[N])
: ArrayRef<T>(Arr) {}
T *data() const { return const_cast<T*>(ArrayRef<T>::data()); }
@@ -378,4 +401,9 @@ namespace llvm {
};
} // namespace llvm
#ifdef DEFINED_LLVM_CONSTEXPR
# undef DEFINED_LLVM_CONSTEXPR
# undef LLVM_CONSTEXPR
#endif
#endif