pqxx::nullness< std::string_view > Struct Reference

There's no real null for std::string_view. More...

Inheritance diagram for pqxx::nullness< std::string_view >:

Static Public Member Functions
static bool	is_null (std::string_view const &value)
	Is value a null?
static std::string_view	null ()
	Return a null value.
Static Public Member Functions inherited from pqxx::no_null< std::string_view >
static constexpr bool	is_null (std::string_view const &) noexcept
	Does a given value correspond to an SQL null value?

Static Public Attributes
static bool	has_null
	Does this type have a null value?
static bool	always_null
	Is this type always null?
Static Public Attributes inherited from pqxx::no_null< std::string_view >
static constexpr bool	has_null
	Does TYPE have a "built-in null value"?
static constexpr bool	always_null
	Are all values of this type null?

Detailed Description

There's no real null for std::string_view.

I'm not sure how clear-cut this is: a string_view may have a null data pointer, which is analogous to a null char pointer.

Member Function Documentation

is_null()

bool pqxx::nullness< std::string_view, void >::is_null ( std::string_view const & value )

static

Is value a null?

null()

std::string_view pqxx::nullness< std::string_view, void >::null ( )

staticnodiscard

Return a null value.

Don't use this in generic code to compare a value and see whether it is null. Some types may have multiple null values which do not compare as equal, or may define a null value which is not equal to anything including itself, like in SQL.

Member Data Documentation

always_null

bool pqxx::nullness< std::string_view, void >::always_null

static

Is this type always null?

has_null

bool pqxx::nullness< std::string_view, void >::has_null

static

Does this type have a null value?

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

• /builddir/build/BUILD/libpqxx-7.10.5-build/libpqxx-7.10.5/redhat-linux-build/include/pqxx/internal/conversions.hxx