void_t.hpp

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#pragma once
 
/// @file userver/utils/void_t.hpp
/// @brief @copybrief utils::void_t
 
#include <type_traits>
 
USERVER_NAMESPACE_BEGIN
 
namespace utils {
 
#if (__cpp_lib_void_t >= 201411 && !defined(__clang__)) || defined(DOXYGEN)
/// @brief std::void_t implementation with workarounds for compiler bugs
///
/// @ingroup userver_universal
template <typename... T>
using void_t = std::void_t<T...>;
#else
 
template <typename... T>
struct make_void_t {
  using type = void;
};
template <typename... T>
using void_t = typename make_void_t<T...>::type;
 
#endif
 
}  // namespace utils
 
USERVER_NAMESPACE_END