125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
#ifndef QUERY_CONVERT_HPP
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#define QUERY_CONVERT_HPP
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#include "matador/utils/types.hpp"
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#include <array>
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#include <charconv>
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#include <stdexcept>
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#include <string>
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#include <type_traits>
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namespace matador::sql {
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template < typename DestType, typename SourceType >
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void convert(DestType &dest, SourceType source, typename std::enable_if<std::is_same<DestType, SourceType>::value>::type* = nullptr)
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{
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dest = source;
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}
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template < typename DestType, typename SourceType >
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void convert(DestType &dest, SourceType source, typename std::enable_if<std::is_integral<DestType>::value && std::is_arithmetic<SourceType>::value && !std::is_same<DestType, SourceType>::value>::type* = nullptr)
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{
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dest = static_cast<DestType>(source);
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}
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template < typename DestType, typename SourceType >
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void convert(DestType &dest, SourceType source, typename std::enable_if<std::is_floating_point<DestType>::value && std::is_arithmetic<SourceType>::value && !std::is_same<DestType, SourceType>::value>::type* = nullptr)
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{
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dest = static_cast<DestType>(source);
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}
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void convert(std::string &dest, bool source);
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template < typename SourceType >
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void convert(std::string &dest, SourceType source, typename std::enable_if<std::is_integral<SourceType>::value && !std::is_same<bool, SourceType>::value>::type* = nullptr)
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{
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std::array<char, 128> buffer{};
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auto [ptr, ec] = std::to_chars(buffer.data(), buffer.data() + buffer.size(), source, 10);
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if (ec == std::errc{}) {
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dest.assign(buffer.data(), ptr);
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} else {
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throw std::logic_error("couldn't convert value to std::string");
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}
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}
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template < typename SourceType >
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void convert(std::string &dest, SourceType source, typename std::enable_if<std::is_floating_point<SourceType>::value>::type* = nullptr)
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{
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std::array<char, 128> buffer{};
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auto [ptr, ec] = std::to_chars(buffer.data(), buffer.data() + buffer.size(), source);
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if (ec == std::errc{}) {
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dest.assign(buffer.data(), ptr);
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} else {
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throw std::logic_error("couldn't convert value to std::string");
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}
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}
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template < typename SourceType >
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void convert(utils::blob &dest, SourceType source, typename std::enable_if<!std::is_same<utils::blob, SourceType>::value>::type* = nullptr)
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{
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throw std::logic_error("couldn't convert value to matador::utils::blob");
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}
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void convert(std::string &dest, const char* source);
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unsigned long long to_unsigned_long_long(const char *source);
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template < typename DestType >
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void convert(DestType &dest, const std::string &source, typename std::enable_if<std::is_integral<DestType>::value && std::is_unsigned<DestType>::value>::type* = nullptr)
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{
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dest = to_unsigned_long_long(source.c_str());
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}
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template < typename DestType >
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void convert(DestType &dest, const char *source, typename std::enable_if<std::is_integral<DestType>::value && std::is_unsigned<DestType>::value>::type* = nullptr)
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{
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dest = to_unsigned_long_long(source);
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}
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long long to_long_long(const char *source);
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template < typename DestType >
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void convert(DestType &dest, const std::string &source, typename std::enable_if<std::is_integral<DestType>::value && std::is_signed<DestType>::value>::type* = nullptr)
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{
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dest = to_long_long(source.c_str());
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}
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template < typename DestType >
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void convert(DestType &dest, const char *source, typename std::enable_if<std::is_integral<DestType>::value && std::is_signed<DestType>::value>::type* = nullptr)
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{
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dest = to_long_long(source);
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}
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long double to_double(const char *source);
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template < typename DestType >
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void convert(DestType &dest, const std::string &source, typename std::enable_if<std::is_floating_point<DestType>::value>::type* = nullptr)
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{
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dest = to_double(source.c_str());
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}
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template < typename DestType >
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void convert(DestType &dest, const char *source, typename std::enable_if<std::is_floating_point<DestType>::value>::type* = nullptr)
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{
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dest = to_double(source);
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}
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template < typename DestType >
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void convert(DestType &dest, bool source, typename std::enable_if<std::is_floating_point<DestType>::value>::type* = nullptr)
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{
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dest = static_cast<DestType>(source);
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}
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template < typename DestType >
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void convert(DestType &dest, const utils::blob &data)
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{
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throw std::logic_error("couldn't convert matador::utils::blob into destination type");
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}
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void convert(utils::blob &dest, const utils::blob &data);
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}
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#endif //QUERY_CONVERT_HPP
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