pqxx::all_null< TYPE, null_value > Struct Template Reference

Nullness traits describing a type whose values are always null. More...

#include <strconv.hxx>

Static Public Member Functions
static constexpr PQXX_PURE bool	is_null (TYPE const &) noexcept
	Is the given TYPE value a null? More...
static constexpr PQXX_PURE TYPE	null ()
	Return a sample null value. Requires TYPE to be default-constructible. More...

Static Public Attributes
static constexpr bool	has_null = true
	Does TYPE have a null value? More...
static constexpr bool	always_null = true
	Is TYPE always null? More...

Detailed Description

template<typename TYPE, TYPE null_value>
struct pqxx::all_null< TYPE, null_value >

Nullness traits describing a type whose values are always null.

If you're writing a nullness specialisation for such a type, you can optionally derive it from this type to save yourself a bit of code.

The second template parameter specifies a compile-time constant null value of this type.

Member Function Documentation

is_null()

template<typename TYPE , TYPE null_value>

static constexpr PQXX_PURE bool pqxx::all_null< TYPE, null_value >::is_null ( TYPE const &  )

inlinestaticconstexprnoexcept

Is the given TYPE value a null?

null()

template<typename TYPE , TYPE null_value>

static constexpr PQXX_PURE TYPE pqxx::all_null< TYPE, null_value >::null ( )

inlinestaticconstexpr

Return a sample null value. Requires TYPE to be default-constructible.

Member Data Documentation

always_null

template<typename TYPE , TYPE null_value>

constexpr bool pqxx::all_null< TYPE, null_value >::always_null = true

staticconstexpr

Is TYPE always null?

has_null

template<typename TYPE , TYPE null_value>

constexpr bool pqxx::all_null< TYPE, null_value >::has_null = true

staticconstexpr

Does TYPE have a null value?

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

• include/pqxx/strconv.hxx