future.hpp

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#pragma once

#include <zk/config.hpp>

#ifndef ZKPP_FUTURE_USE_STD_EXPERIMENTAL
#   define ZKPP_FUTURE_USE_STD_EXPERIMENTAL 0
#endif

#ifndef ZKPP_FUTURE_USE_CUSTOM
#   define ZKPP_FUTURE_USE_CUSTOM 0
#endif

#ifndef ZKPP_FUTURE_USE_STD
#   if ZKPP_FUTURE_USE_STD_EXPERIMENTAL || ZKPP_FUTURE_USE_CUSTOM
#       define ZKPP_FUTURE_USE_STD 0
#   else
#       define ZKPP_FUTURE_USE_STD 1
#   endif
#endif

#if ZKPP_FUTURE_USE_STD
#   define ZKPP_FUTURE_INCLUDE   <future>
#   define ZKPP_FUTURE_TEMPLATE  std::future
#   define ZKPP_PROMISE_TEMPLATE std::promise
#elif ZKPP_FUTURE_USE_STD_EXPERIMENTAL
#   define ZKPP_FUTURE_INCLUDE   <experimental/future>
#   define ZKPP_FUTURE_TEMPLATE  std::experimental::future
#   define ZKPP_PROMISE_TEMPLATE std::experimental::promise
#elif ZKPP_FUTURE_USE_CUSTOM
#   if !defined ZKPP_FUTURE_TEMPLATE || !defined ZKPP_PROMISE_TEMPLATE || !defined ZKPP_FUTURE_INCLUDE
#       error "When ZKPP_FUTURE_USE_CUSTOM is set, you must also define ZKPP_FUTURE_TEMPLATE, ZKPP_PROMISE_TEMPLATE,"
#       error "and ZKPP_FUTURE_INCLUDE."
#   endif
#else
#   error "Unknown type to use for zk::future and zk::promise"
#endif

#include ZKPP_FUTURE_INCLUDE

namespace zk
{

template <typename T>
using future = ZKPP_FUTURE_TEMPLATE<T>;

template <typename T>
using promise = ZKPP_PROMISE_TEMPLATE<T>;

}