Concepts

Description

Database-related type system concepts.

Classes
interface	Array
	Array concept represents PostgreSQL array. More...
interface	Composite
	Composite concept represents PostgreSQL composite types. More...

Variables
template<typename T >
constexpr bool	ozo::BuiltIn
	Condition indicates if the specified type is built-in for PG. More...
template<typename T >
constexpr auto	ozo::DynamicSize
	Condition indicates if the specified type is has dynamic size. More...
template<typename T >
constexpr auto	ozo::StaticSize
	Condition indicates if the specified type is has fixed size. More...
template<typename T >
constexpr auto	ozo::OidMap
	Map of C++ types to corresponding PostgreSQL types OIDs. More...

Variable Documentation

BuiltIn

template<typename T >

constexpr bool ozo::BuiltIn

constexpr

Condition indicates if the specified type is built-in for PG.

Template Parameters

T	— type to check

DynamicSize

template<typename T >

constexpr auto ozo::DynamicSize

constexpr

Condition indicates if the specified type is has dynamic size.

Template Parameters

T	— type to check

OidMap

template<typename T >

constexpr auto ozo::OidMap

constexpr

Map of C++ types to corresponding PostgreSQL types OIDs.

OidMap is needed to store information about C++ types and corresponding custom database types' OIDs. For PostgreSQL built-in types no mapping is needed since their OIDs are defined in PostgreSQL sources. For custom types their OIDs are defined in a database.

OidMap Definition

OidMap map is an object for which these next statements are valid:

oid_t oid;
//...
set_type_oid<T>(map, oid);

Sets oid for type T in the map.

oid_t oid = type_oid<T>(map);

Returns oid value for type T from the map.

bool res = empty(map);

Returns true if map has no types OIDs.

See also

oid_map_t, register_types(), set_type_oid(), type_oid(), accepts_oid()

StaticSize

template<typename T >

constexpr auto ozo::StaticSize

constexpr

Condition indicates if the specified type is has fixed size.

Template Parameters

T	— type to check