pqxx::internal::enum_traits< ENUM > Struct Template Reference

Helper class for defining enum conversions. More...

#include <strconv.hxx>

Public Types
using	impl_type = std::underlying_type_t< ENUM >

Static Public Member Functions
static constexpr std::string_view	to_buf (std::span< char > buf, ENUM const &value, ctx c={})
static ENUM	from_string (std::string_view text, ctx c={})
static constexpr std::size_t	size_buffer (ENUM const &value) noexcept

Detailed Description

template<enum_type ENUM>
struct pqxx::internal::enum_traits< ENUM >

Helper class for defining enum conversions.

The conversion will convert enum values to numeric strings, and vice versa.

Warning

These numeric strings do not actually help you with the database, where enum values are textual strings. Once we have reflection in C++26, it should become easier to provide real support.

To define a string conversion for an enum type, derive a string_traits specialisation for the enum from this struct.

There's usually an easier way though: the PQXX_DECLARE_ENUM_CONVERSION macro. Use enum_traits manually only if you need to customise your traits type in more detail.

Member Typedef Documentation

impl_type

template<enum_type ENUM>

using pqxx::internal::enum_traits< ENUM >::impl_type = std::underlying_type_t<ENUM>

Member Function Documentation

from_string()

template<enum_type ENUM>

static ENUM pqxx::internal::enum_traits< ENUM >::from_string ( std::string_view  text, ctx  c = {}  )

inlinestatic

size_buffer()

template<enum_type ENUM>

static constexpr std::size_t pqxx::internal::enum_traits< ENUM >::size_buffer ( ENUM const &  value )

inlinestaticconstexprnoexcept

to_buf()

template<enum_type ENUM>

static constexpr std::string_view pqxx::internal::enum_traits< ENUM >::to_buf ( std::span< char >  buf, ENUM const &  value, ctx  c = {}  )

inlinestaticconstexpr

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The documentation for this struct was generated from the following file:

• include/pqxx/strconv.hxx