cuda_toolkit/include/thrust/detail/config/host_device.h

/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  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.
 */

/*! \file host_device.h
 *  \brief Defines __host__ and __device__
 */

#pragma once

// Internal config header that is only included through thrust/detail/config/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

// since nvcc defines __host__ and __device__ for us,
// and only nvcc knows what to do with __host__ and __device__,
// define them to be the empty string for other compilers

#if THRUST_DEVICE_COMPILER != THRUST_DEVICE_COMPILER_NVCC

// since __host__ & __device__ might have already be defined, only
// #define them if not defined already
// XXX this will break if the client does #include <host_defines.h> later

#ifndef __host__
#define __host__
#endif // __host__

#ifndef __device__
#define __device__
#endif // __device__

#endif