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