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#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#if defined(_CCCL_COMPILER_MSVC)
// MSVC ICEs when using the standard C++11 `_Pragma` operator with OpenMP
// directives.
// WAR this by using the MSVC-extension `__pragma`. See this link for more info:
// https://developercommunity.visualstudio.com/t/Using-C11s-_Pragma-with-OpenMP-dire/1590628
#  define THRUST_PRAGMA_OMP_IMPL(directive) __pragma(directive)
#else // Not MSVC:
#  define THRUST_PRAGMA_OMP_IMPL(directive) _Pragma(#directive)
#endif

// For internal use only -- THRUST_PRAGMA_OMP is used to switch between
// different flavors of openmp pragmas. Pragmas are not emitted when OpenMP is
// not available.
//
// Usage:
//   Replace: #pragma omp parallel for
//   With   : THRUST_PRAGMA_OMP(parallel for)
//
#if defined(_NVHPC_STDPAR_OPENMP) && _NVHPC_STDPAR_OPENMP == 1
#  define THRUST_PRAGMA_OMP(directive) THRUST_PRAGMA_OMP_IMPL(omp_stdpar directive)
#elif defined(_OPENMP)
#  define THRUST_PRAGMA_OMP(directive) THRUST_PRAGMA_OMP_IMPL(omp directive)
#else
#  define THRUST_PRAGMA_OMP(directive)
#endif