1 /*===---- complex - CUDA wrapper for <algorithm> ----------------------------===
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21 *===-----------------------------------------------------------------------===
24 #ifndef __CLANG_CUDA_WRAPPERS_ALGORITHM
25 #define __CLANG_CUDA_WRAPPERS_ALGORITHM
27 // This header defines __device__ overloads of std::min/max, but only if we're
28 // <= C++11. In C++14, these functions are constexpr, and so are implicitly
29 // __host__ __device__.
31 // We don't support the initializer_list overloads because
32 // initializer_list::begin() and end() are not __host__ __device__ functions.
34 // When compiling in C++14 mode, we could force std::min/max to have different
35 // implementations for host and device, by declaring the device overloads
36 // before the constexpr overloads appear. We choose not to do this because
38 // a) why write our own implementation when we can use one from the standard
40 // b) libstdc++ is evil and declares min/max inside a header that is included
41 // *before* we include <algorithm>. So we'd have to unconditionally
42 // declare our __device__ overloads of min/max, but that would pollute
43 // things for people who choose not to include <algorithm>.
45 #include_next <algorithm>
47 #if __cplusplus <= 201103L
49 // We need to define these overloads in exactly the namespace our standard
50 // library uses (including the right inline namespace), otherwise they won't be
51 // picked up by other functions in the standard library (e.g. functions in
52 // <complex>). Thus the ugliness below.
53 #ifdef _LIBCPP_BEGIN_NAMESPACE_STD
54 _LIBCPP_BEGIN_NAMESPACE_STD
57 #ifdef _GLIBCXX_BEGIN_NAMESPACE_VERSION
58 _GLIBCXX_BEGIN_NAMESPACE_VERSION
62 template <class __T, class __Cmp>
63 inline __device__ const __T &
64 max(const __T &__a, const __T &__b, __Cmp __cmp) {
65 return __cmp(__a, __b) ? __b : __a;
69 inline __device__ const __T &
70 max(const __T &__a, const __T &__b) {
71 return __a < __b ? __b : __a;
74 template <class __T, class __Cmp>
75 inline __device__ const __T &
76 min(const __T &__a, const __T &__b, __Cmp __cmp) {
77 return __cmp(__b, __a) ? __b : __a;
81 inline __device__ const __T &
82 min(const __T &__a, const __T &__b) {
83 return __a < __b ? __b : __a;
86 #ifdef _LIBCPP_END_NAMESPACE_STD
87 _LIBCPP_END_NAMESPACE_STD
89 #ifdef _GLIBCXX_BEGIN_NAMESPACE_VERSION
90 _GLIBCXX_END_NAMESPACE_VERSION
95 #endif // __cplusplus <= 201103L
96 #endif // __CLANG_CUDA_WRAPPERS_ALGORITHM