libpqxx
7.7.0
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Traits describing a type's "null value," if any. More...
#include <strconv.hxx>
Static Public Member Functions | |
static bool | is_null (TYPE const &value) |
Is value a null? More... | |
static TYPE | null () |
Return a null value. More... | |
Static Public Attributes | |
static bool | has_null |
Does this type have a null value? More... | |
static bool | always_null |
Is this type always null? More... | |
Traits describing a type's "null value," if any.
Some C++ types have a special value or state which correspond directly to SQL's NULL.
The nullness
traits describe whether it exists, and whether a particular value is null.