execution_backend.hpp

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#pragma once
 
#ifndef __has_include
#define __has_include(x) 0
#endif
 
#include <version>
 
// TODO: This path has not been tested, as no standard library provides
// std::execution yet.
#if defined(__cpp_lib_senders)
#include <execution>
#define CONDY_DETAIL_HAS_EXECUTION 1
#elif __has_include(<stdexec/execution.hpp>)
#include <stdexec/execution.hpp>
#define CONDY_DETAIL_HAS_EXECUTION 1
#elif __has_include(<beman/execution.hpp>)
#include <beman/execution.hpp>
#define CONDY_DETAIL_HAS_EXECUTION 1
#endif
 
#ifdef CONDY_DETAIL_HAS_EXECUTION
 
namespace condy {
namespace detail {
 
#if defined(__cpp_lib_senders)
namespace ex = std::execution;
#elif __has_include(<stdexec/execution.hpp>)
namespace ex = stdexec;
#elif __has_include(<beman/execution.hpp>)
namespace ex = beman::execution;
#endif
 
} // namespace detail
} // namespace condy
 
#endif