convert.hpp

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#pragma once
 
/// @file userver/storages/mysql/convert.hpp
/// @brief MySQL value conversion tag `To` and helper `DoConvert`
 
#include <type_traits>
#include <utility>
 
USERVER_NAMESPACE_BEGIN
 
namespace storages::mysql::convert {
 
template <typename T>
struct To final {};
 
namespace impl {
 
template <typename T, typename DbType>
concept HasConvert = requires(DbType&& from) { Convert(std::forward<DbType>(from), convert::To<T>{}); };
 
}  // namespace impl
 
template <typename T, typename DbType>
T DoConvert(DbType&& from) {
    static_assert(
        // TODO : better wording
        impl::HasConvert<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