decimal64.hpp

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#pragma once
 
/// @file userver/storages/postgres/io/decimal64.hpp
/// @brief decimal64::Decimal I/O support
/// @ingroup userver_postgres_parse_and_format
 
#include <userver/decimal64/decimal64.hpp>
#include <userver/storages/postgres/io/buffer_io.hpp>
#include <userver/storages/postgres/io/buffer_io_base.hpp>
#include <userver/storages/postgres/io/numeric_data.hpp>
#include <userver/storages/postgres/io/type_mapping.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace storages::postgres::io {
 
template <int Prec, typename RoundPolicy>
struct BufferFormatter<decimal64::Decimal<Prec, RoundPolicy>>
    : detail::BufferFormatterBase<decimal64::Decimal<Prec, RoundPolicy>> {
    using BaseType = detail::BufferFormatterBase<decimal64::Decimal<Prec, RoundPolicy>>;
    using BaseType::BaseType;
    using ValueType = typename BaseType::ValueType;
 
    template <typename Buffer>
    void operator()(const UserTypes&, Buffer& buffer) const {
        auto bin_str = detail::Int64ToNumericBuffer({this->value.AsUnbiased(), Prec});
        buffer.reserve(buffer.size() + bin_str.size());
        std::ranges::copy(bin_str, std::back_inserter(buffer));
    }
};
 
template <int Prec, typename RoundPolicy>
struct BufferParser<decimal64::Decimal<Prec, RoundPolicy>>
    : detail::BufferParserBase<decimal64::Decimal<Prec, RoundPolicy>> {
    using BaseType = detail::BufferParserBase<decimal64::Decimal<Prec, RoundPolicy>>;
    using BaseType::BaseType;
    using ValueType = typename BaseType::ValueType;
 
    void operator()(const FieldBuffer& buffer) {
        auto rep = detail::NumericBufferToInt64(buffer);
        this->value = ValueType::FromBiased(rep.value, rep.fractional_digit_count);
    }
};
 
template <int Prec, typename RoundPolicy>
struct CppToSystemPg<decimal64::Decimal<Prec, RoundPolicy>> : PredefinedOid<PredefinedOids::kNumeric> {};
}  // namespace storages::postgres::io
 
USERVER_NAMESPACE_END