convert.hpp

#pragma once
 
#include <type_traits>
#include <utility>
 
#include <userver/utils/meta_light.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace storages::mysql::convert {
 
template <typename T>
struct To final {};
 
namespace impl {
 
template <typename T, typename DbType>
using HasConvert = decltype(Convert(std::declval<DbType&&>(), convert::To<T>{}));
 
template <typename T, typename DbType>
inline constexpr bool kHasConvert = meta::kIsDetected<HasConvert, T, DbType>;
 
}  // namespace impl
 
template <typename T, typename DbType>
T DoConvert(DbType&& from) {
    static_assert(
        // TODO : better wording
        impl::kHasConvert<T, DbType>,
        "There is no 'T Convert(From&&, storages::mysql::convert::To<T>)' in "
        "neither namespace of 'T' or `storages::mysql::convert`"
    );
 
    return Convert(std::forward<DbType>(from), To<T>{});
}
 
}  // namespace storages::mysql::convert
 
USERVER_NAMESPACE_END