buffer_io_base.hpp

#pragma once
 
#include <userver/storages/postgres/io/type_mapping.hpp>
#include <userver/utils/void_t.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace storages::postgres::io::detail {
 
template <typename T, typename = USERVER_NAMESPACE::utils::void_t<>>
struct ShouldInitMapping : std::false_type {};
 
template <typename T>
struct ShouldInitMapping<T, USERVER_NAMESPACE::utils::void_t<decltype(T::init)>> : std::true_type {};
 
template <typename T>
struct BufferParserBase {
    using ValueType = T;
 
    ValueType& value;
    explicit BufferParserBase(ValueType& v)
        : value{v}
    {
        using PgMapping = CppToPg<ValueType>;
        if constexpr (ShouldInitMapping<PgMapping>{}) {
            ForceReference(PgMapping::init);
        }
    }
};
 
template <typename T>
struct BufferParserBase<T&&> {
    using ValueType = T;
 
    ValueType value;
    explicit BufferParserBase(ValueType&& v)
        : value{std::move(v)}
    {
        using PgMapping = CppToPg<ValueType>;
        if constexpr (ShouldInitMapping<PgMapping>{}) {
            ForceReference(PgMapping::init);
        }
    }
};
 
template <typename T>
struct BufferFormatterBase {
    using ValueType = T;
    const ValueType& value;
    explicit BufferFormatterBase(const ValueType& v)
        : value{v}
    {}
};
 
}  // namespace storages::postgres::io::detail
 
USERVER_NAMESPACE_END