#include <QMetaEnum>
#include <cfloat>
#include <memory>
#include <cmath>
#include "qgis_core.h"
#include "qgis_sip.h"

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Classes
class	Qgis
	The Qgis class provides global constants for use throughout the application. More...

class	QgsSignalBlocker< Object >
	RAII signal blocking class. More...

Macros
#define	BUILTIN_UNREACHABLE

#define	cast_to_fptr(f) f

#define	CONSTLATIN1STRING constexpr QLatin1String

#define	MAYBE_UNUSED

#define	NODISCARD Q_REQUIRED_RESULT

#define	Q_NOWARN_DEPRECATED_POP

#define	Q_NOWARN_DEPRECATED_PUSH

#define	Q_NOWARN_UNREACHABLE_POP

#define	Q_NOWARN_UNREACHABLE_PUSH

#define	QGISEXTERN extern "C"

#define	QHASH_FOR_CLASS_ENUM(T)

Typedefs
typedef unsigned long long	qgssize
	Qgssize is used instead of size_t, because size_t is stdlib type, unknown by SIP, and it would be hard to define size_t correctly in SIP.

typedef QMap< QString, QString >	QgsStringMap

Functions
CONSTLATIN1STRING	geoEpsgCrsAuthId ()
	Geographic coord sys from EPSG authority.

CONSTLATIN1STRING	geoNone ()
	Constant that holds the string representation for "No ellips/No CRS".

CONSTLATIN1STRING	geoProj4 ()
	PROJ4 string that represents a geographic coord sys.

CONSTLATIN1STRING	geoWkt ()
	Wkt string that represents a geographic coord sys.

bool	operator< (const QVariant &v1, const QVariant &v2)
	Compares two QVariant values and returns whether the first is less than the second.

bool	operator> (const QVariant &v1, const QVariant &v2)
	Compares two QVariant values and returns whether the first is greater than the second.

bool	qgsDoubleNear (double a, double b, double epsilon=4 *std::numeric_limits< double >::epsilon())
	Compare two doubles (but allow some difference)

bool	qgsDoubleNearSig (double a, double b, int significantDigits=10)
	Compare two doubles using specified number of significant digits.

QString	qgsDoubleToString (double a, int precision=17)
	Returns a string representation of a double.

template<class T >
T	qgsEnumKeyToValue (const QString &key, const T &defaultValue, bool tryValueAsKey=true, bool *returnOk=nullptr)
	Returns the value corresponding to the given key of an enum.

template<class T >
const QList< T >	qgsEnumList ()
	Returns a list all enum entries.

template<class T >
const QMap< T, QString >	qgsEnumMap ()
	Returns a map of all enum entries.

template<class T >
QString	qgsEnumValueToKey (const T &value, bool *returnOk=nullptr)
	Returns the value for the given key of an enum.

template<class T >
T	qgsFlagKeysToValue (const QString &keys, const T &defaultValue, bool tryValueAsKey=true, bool *returnOk=nullptr)
	Returns the value corresponding to the given keys of a flag.

template<class T >
QString	qgsFlagValueToKeys (const T &value, bool *returnOk=nullptr)
	Returns the value for the given keys of a flag.

bool	qgsFloatNear (float a, float b, float epsilon=4 *FLT_EPSILON)
	Compare two floats (but allow some difference)

void CORE_EXPORT	qgsFree (void *ptr)
	Frees the memory space pointed to by ptr.

void CORE_EXPORT *	qgsMalloc (size_t size)
	Allocates size bytes and returns a pointer to the allocated memory.

template<class Key , class Value >
QString	qgsMapJoinKeys (const QMap< Key, Value > &map, const QString &separator)
	Joins all the map keys into a single string with each element separated by the given separator.

template<class Key , class Value >
QString	qgsMapJoinValues (const QMap< Key, Value > &map, const QString &separator)
	Joins all the map values into a single string with each element separated by the given separator.

bool	qgsNanCompatibleEquals (double a, double b)
	Compare two doubles, treating nan values as equal.

template<typename T >
bool	qgsNumberNear (T a, T b, T epsilon=std::numeric_limits< T >::epsilon() *4)
	Compare two numbers of type T (but allow some difference)

CORE_EXPORT double	qgsPermissiveToDouble (QString string, bool &ok)
	Converts a string to a double in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

CORE_EXPORT int	qgsPermissiveToInt (QString string, bool &ok)
	Converts a string to an integer in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

CORE_EXPORT qlonglong	qgsPermissiveToLongLong (QString string, bool &ok)
	Converts a string to an qlonglong in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

double	qgsRound (double number, int places)
	Returns a double number, rounded (as close as possible) to the specified number of places.

template<class T >
QString	qgsSetJoin (const QSet< T > &set, const QString &separator)
	Joins all the set values into a single string with each element separated by the given separator.

CORE_EXPORT bool	qgsVariantEqual (const QVariant &lhs, const QVariant &rhs)
	Compares two QVariant values and returns whether they are equal, two NULL values are always treated as equal and 0 is not treated as equal with NULL.

CORE_EXPORT bool	qgsVariantGreaterThan (const QVariant &lhs, const QVariant &rhs)
	Compares two QVariant values and returns whether the first is greater than the second.

CORE_EXPORT bool	qgsVariantLessThan (const QVariant &lhs, const QVariant &rhs)
	Compares two QVariant values and returns whether the first is less than the second.

CORE_EXPORT QString	qgsVsiPrefix (const QString &path)

CORE_EXPORT uint	qHash (const QVariant &variant)
	Hash for QVariant.

template<class Object >
QgsSignalBlocker< Object >	whileBlocking (Object *object)
	Temporarily blocks signals from a QObject while calling a single method from the object.

Variables
const double	DEFAULT_LINE_WIDTH = 0.26

const double	DEFAULT_POINT_SIZE = 2.0
	Magic number that determines the default point size for point symbols.

const double	DEFAULT_SEGMENT_EPSILON = 1e-8
	Default snapping tolerance for segments.

const long	GEO_EPSG_CRS_ID = 4326
	Magic number for a geographic coord sys in EpsgCrsId ID format.

const long	GEOCRS_ID = 3452
	Magic number for a geographic coord sys in QGIS srs.db tbl_srs.srs_id.

const long	GEOSRID = 4326
	Magic number for a geographic coord sys in POSTGIS SRID.

const int	USER_CRS_START_ID = 100000
	Magick number that determines whether a projection crsid is a system (srs.db) or user (~/.qgis.qgis.db) defined projection.

Macro Definition Documentation

◆ BUILTIN_UNREACHABLE

#define BUILTIN_UNREACHABLE

Definition at line 6720 of file qgis.h.

◆ cast_to_fptr

#define cast_to_fptr ( f ) f

Definition at line 5918 of file qgis.h.

◆ CONSTLATIN1STRING

#define CONSTLATIN1STRING constexpr QLatin1String

Definition at line 6502 of file qgis.h.

◆ MAYBE_UNUSED

#define MAYBE_UNUSED

Definition at line 6695 of file qgis.h.

◆ NODISCARD

#define NODISCARD Q_REQUIRED_RESULT

Definition at line 6679 of file qgis.h.

◆ Q_NOWARN_DEPRECATED_POP

#define Q_NOWARN_DEPRECATED_POP

Definition at line 6643 of file qgis.h.

◆ Q_NOWARN_DEPRECATED_PUSH

#define Q_NOWARN_DEPRECATED_PUSH

Definition at line 6642 of file qgis.h.

◆ Q_NOWARN_UNREACHABLE_POP

#define Q_NOWARN_UNREACHABLE_POP

Definition at line 6645 of file qgis.h.

◆ Q_NOWARN_UNREACHABLE_PUSH

#define Q_NOWARN_UNREACHABLE_PUSH

Definition at line 6644 of file qgis.h.

◆ QGISEXTERN

#define QGISEXTERN extern "C"

Definition at line 6657 of file qgis.h.

◆ QHASH_FOR_CLASS_ENUM

#define QHASH_FOR_CLASS_ENUM ( T )

Value:

  inline uint qHash(const T &t, uint seed) { \
    return ::qHash(static_cast<typename std::underlying_type<T>::type>(t), seed); \
  }

Definition at line 43 of file qgis.h.

Typedef Documentation

◆ qgssize

typedef unsigned long long qgssize

Qgssize is used instead of size_t, because size_t is stdlib type, unknown by SIP, and it would be hard to define size_t correctly in SIP.

Currently used "unsigned long long" was introduced in C++11 (2011) but it was supported already before C++11 on common platforms. "unsigned long long int" gives syntax error in SIP. KEEP IN SYNC WITH qgssize defined in SIP!

Definition at line 6614 of file qgis.h.

◆ QgsStringMap

typedef QMap<QString, QString> QgsStringMap

Definition at line 6604 of file qgis.h.

Function Documentation

◆ geoEpsgCrsAuthId()

CONSTLATIN1STRING geoEpsgCrsAuthId ( )

Geographic coord sys from EPSG authority.

Definition at line 6555 of file qgis.h.

◆ geoNone()

CONSTLATIN1STRING geoNone ( )

Constant that holds the string representation for "No ellips/No CRS".

Definition at line 6561 of file qgis.h.

◆ geoProj4()

CONSTLATIN1STRING geoProj4 ( )

PROJ4 string that represents a geographic coord sys.

Definition at line 6549 of file qgis.h.

◆ geoWkt()

CONSTLATIN1STRING geoWkt ( )

Wkt string that represents a geographic coord sys.

Since: QGIS GEOWkt

Definition at line 6541 of file qgis.h.

◆ operator<()

bool operator<	(	const QVariant &	v1,
		const QVariant &	v2
	)

inline

Compares two QVariant values and returns whether the first is less than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

Invalid < NULL < Values

See also: qgsVariantGreaterThan()

Definition at line 6467 of file qgis.h.

◆ operator>()

bool operator>	(	const QVariant &	v1,
		const QVariant &	v2
	)

inline

Compares two QVariant values and returns whether the first is greater than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

See also: qgsVariantLessThan()

Definition at line 6453 of file qgis.h.

◆ qgsDoubleNear()

bool qgsDoubleNear	(	double	a,
		double	b,
		double	epsilon = `4 * std::numeric_limits<double>::epsilon()`
	)

inline

Compare two doubles (but allow some difference)

Parameters

a	first double
b	second double
epsilon	maximum difference allowable between doubles

Definition at line 6066 of file qgis.h.

◆ qgsDoubleNearSig()

bool qgsDoubleNearSig	(	double	a,
		double	b,
		int	significantDigits = `10`
	)

inline

Compare two doubles using specified number of significant digits.

Definition at line 6083 of file qgis.h.

◆ qgsDoubleToString()

QString qgsDoubleToString	(	double	a,
		int	precision = `17`
	)

inline

Returns a string representation of a double.

Parameters

a	double value
precision	number of decimal places to retain

Definition at line 5983 of file qgis.h.

◆ qgsEnumKeyToValue()

template<class T >

T qgsEnumKeyToValue	(	const QString &	key,
		const T &	defaultValue,
		bool	tryValueAsKey = `true`,
		bool *	returnOk = `nullptr`
	)

Returns the value corresponding to the given key of an enum.

If the key is invalid, it will return the defaultValue. If tryValueAsKey is true, it will try to convert the string key to an enum value If returnOk is given, it defines if the key could be converted to the value or if it had returned the default

Since: QGIS 3.6

Definition at line 6276 of file qgis.h.

◆ qgsEnumList()

template<class T >

const QList< T > qgsEnumList ( )

Returns a list all enum entries.

The enum must have been declared using Q_ENUM or Q_FLAG.

Definition at line 6223 of file qgis.h.

◆ qgsEnumMap()

template<class T >

const QMap< T, QString > qgsEnumMap ( )

Returns a map of all enum entries.

The map has the enum values (int) as keys and the enum keys (QString) as values. The enum must have been declared using Q_ENUM or Q_FLAG.

Definition at line 6240 of file qgis.h.

◆ qgsEnumValueToKey()

template<class T >

QString qgsEnumValueToKey	(	const T &	value,
		bool *	returnOk = `nullptr`
	)

Returns the value for the given key of an enum.

If returnOk is given, it defines if the value could be converted to the key

Since: QGIS 3.6

Definition at line 6257 of file qgis.h.

◆ qgsFlagKeysToValue()

template<class T >

T qgsFlagKeysToValue	(	const QString &	keys,
		const T &	defaultValue,
		bool	tryValueAsKey = `true`,
		bool *	returnOk = `nullptr`
	)

Returns the value corresponding to the given keys of a flag.

If the keys are invalid, it will return the defaultValue. If tryValueAsKey is true, it will try to convert the string key to an enum value. If returnOk is given, it defines if the key could be converted to the value or if it had returned the default

Since: QGIS 3.16

Definition at line 6337 of file qgis.h.

◆ qgsFlagValueToKeys()

template<class T >

QString qgsFlagValueToKeys	(	const T &	value,
		bool *	returnOk = `nullptr`
	)

Returns the value for the given keys of a flag.

If returnOk is given, it defines if the value could be converted to the keys

Since: QGIS 3.16

Definition at line 6315 of file qgis.h.

◆ qgsFloatNear()

bool qgsFloatNear	(	float	a,
		float	b,
		float	epsilon = `4 * FLT_EPSILON`
	)

inline

Compare two floats (but allow some difference)

Parameters

a	first float
b	second float
epsilon	maximum difference allowable between floats

Definition at line 6077 of file qgis.h.

◆ qgsFree()

void CORE_EXPORT qgsFree ( void * ptr )

Frees the memory space pointed to by ptr.

Works like C free().

Parameters

ptr	pointer to memory space

Definition at line 116 of file qgis.cpp.

◆ qgsMalloc()

void CORE_EXPORT * qgsMalloc ( size_t size )

Allocates size bytes and returns a pointer to the allocated memory.

Works like C malloc() but prints debug message by QgsLogger if allocation fails.

Parameters

size	size in bytes

Definition at line 94 of file qgis.cpp.

◆ qgsMapJoinKeys()

template<class Key , class Value >

QString qgsMapJoinKeys	(	const QMap< Key, Value > &	map,
		const QString &	separator
	)

Joins all the map keys into a single string with each element separated by the given separator.

This method avoid calling keys() before joining because it creates an unneeded temporary list see clazy container-anti-pattern

Definition at line 6123 of file qgis.h.

◆ qgsMapJoinValues()

template<class Key , class Value >

QString qgsMapJoinValues	(	const QMap< Key, Value > &	map,
		const QString &	separator
	)

Joins all the map values into a single string with each element separated by the given separator.

This method avoid calling values() before joining because it creates an unneeded temporary list see clazy container-anti-pattern

Definition at line 6140 of file qgis.h.

◆ qgsNanCompatibleEquals()

bool qgsNanCompatibleEquals	(	double	a,
		double	b
	)

inline

Compare two doubles, treating nan values as equal.

Parameters

a	first double
b	second double

Since: QGIS 3.20

Definition at line 6028 of file qgis.h.

◆ qgsNumberNear()

template<typename T >

bool qgsNumberNear	(	T	a,
		T	b,
		T	epsilon = `std::numeric_limits<T>::epsilon() * 4`
	)

inline

Compare two numbers of type T (but allow some difference)

Parameters

a	first number
b	second number
epsilon	maximum difference allowable between numbers

Since: QGIS 3.36

Definition at line 6048 of file qgis.h.

◆ qgsPermissiveToDouble()

CORE_EXPORT double qgsPermissiveToDouble	(	QString	string,
		bool &	ok
	)

Converts a string to a double in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters

string	string to convert
ok	will be set to `true` if conversion was successful

Returns: string converted to double if possible

See also: permissiveToInt

Definition at line 73 of file qgis.cpp.

◆ qgsPermissiveToInt()

CORE_EXPORT int qgsPermissiveToInt	(	QString	string,
		bool &	ok
	)

Converts a string to an integer in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters

string	string to convert
ok	will be set to `true` if conversion was successful

Returns: string converted to int if possible

See also: permissiveToDouble

Definition at line 80 of file qgis.cpp.

◆ qgsPermissiveToLongLong()

CORE_EXPORT qlonglong qgsPermissiveToLongLong	(	QString	string,
		bool &	ok
	)

Converts a string to an qlonglong in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters

string	string to convert
ok	will be set to `true` if conversion was successful

Returns: string converted to int if possible

See also: permissiveToInt

Since: QGIS 3.4

Definition at line 87 of file qgis.cpp.

◆ qgsRound()

double qgsRound	(	double	number,
		int	places
	)

inline

Returns a double number, rounded (as close as possible) to the specified number of places.

Definition at line 6107 of file qgis.h.

◆ qgsSetJoin()

template<class T >

QString qgsSetJoin	(	const QSet< T > &	set,
		const QString &	separator
	)

Joins all the set values into a single string with each element separated by the given separator.

This method avoid calling values() before joining because it creates an unneeded temporary list see clazy container-anti-pattern

Definition at line 6157 of file qgis.h.

◆ qgsVariantEqual()

CORE_EXPORT bool qgsVariantEqual	(	const QVariant &	lhs,
		const QVariant &	rhs
	)

Compares two QVariant values and returns whether they are equal, two NULL values are always treated as equal and 0 is not treated as equal with NULL.

Parameters

lhs	first value
rhs	second value

Returns: true if values are equal

Definition at line 248 of file qgis.cpp.

◆ qgsVariantGreaterThan()

CORE_EXPORT bool qgsVariantGreaterThan	(	const QVariant &	lhs,
		const QVariant &	rhs
	)

Compares two QVariant values and returns whether the first is greater than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

See also: qgsVariantLessThan()

Definition at line 189 of file qgis.cpp.

◆ qgsVariantLessThan()

CORE_EXPORT bool qgsVariantLessThan	(	const QVariant &	lhs,
		const QVariant &	rhs
	)

Compares two QVariant values and returns whether the first is less than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

Invalid < NULL < Values

See also: qgsVariantGreaterThan()

Definition at line 121 of file qgis.cpp.

◆ qgsVsiPrefix()

CORE_EXPORT QString qgsVsiPrefix ( const QString & path )

Definition at line 194 of file qgis.cpp.

◆ qHash()

CORE_EXPORT uint qHash ( const QVariant & variant )

Hash for QVariant.

Definition at line 199 of file qgis.cpp.

◆ whileBlocking()

template<class Object >

QgsSignalBlocker< Object > whileBlocking ( Object * object )

inline

Temporarily blocks signals from a QObject while calling a single method from the object.

Usage: whileBlocking( checkBox )->setChecked( true ); whileBlocking( spinBox )->setValue( 50 );

No signals will be emitted when calling these methods.

See also: QgsSignalBlocker

Note: not available in Python bindings

Definition at line 5970 of file qgis.h.

Variable Documentation

◆ DEFAULT_LINE_WIDTH

const double DEFAULT_LINE_WIDTH = 0.26

Definition at line 6599 of file qgis.h.

◆ DEFAULT_POINT_SIZE

const double DEFAULT_POINT_SIZE = 2.0

Magic number that determines the default point size for point symbols.

Definition at line 6598 of file qgis.h.

◆ DEFAULT_SEGMENT_EPSILON

const double DEFAULT_SEGMENT_EPSILON = 1e-8

Default snapping tolerance for segments.

Definition at line 6602 of file qgis.h.

◆ GEO_EPSG_CRS_ID

const long GEO_EPSG_CRS_ID = 4326

Magic number for a geographic coord sys in EpsgCrsId ID format.

Definition at line 6585 of file qgis.h.

◆ GEOCRS_ID

const long GEOCRS_ID = 3452

Magic number for a geographic coord sys in QGIS srs.db tbl_srs.srs_id.

Definition at line 6582 of file qgis.h.

◆ GEOSRID

const long GEOSRID = 4326

Magic number for a geographic coord sys in POSTGIS SRID.

Definition at line 6579 of file qgis.h.

◆ USER_CRS_START_ID

const int USER_CRS_START_ID = 100000

Magick number that determines whether a projection crsid is a system (srs.db) or user (~/.qgis.qgis.db) defined projection.

Definition at line 6591 of file qgis.h.

Classes

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ BUILTIN_UNREACHABLE

◆ cast_to_fptr

◆ CONSTLATIN1STRING

◆ MAYBE_UNUSED

◆ NODISCARD

◆ Q_NOWARN_DEPRECATED_POP

◆ Q_NOWARN_DEPRECATED_PUSH

◆ Q_NOWARN_UNREACHABLE_POP

◆ Q_NOWARN_UNREACHABLE_PUSH

◆ QGISEXTERN

◆ QHASH_FOR_CLASS_ENUM

Typedef Documentation

◆ qgssize

◆ QgsStringMap

Function Documentation

◆ geoEpsgCrsAuthId()

◆ geoNone()

◆ geoProj4()

◆ geoWkt()

◆ operator<()

◆ operator>()

◆ qgsDoubleNear()

◆ qgsDoubleNearSig()

◆ qgsDoubleToString()

◆ qgsEnumKeyToValue()

◆ qgsEnumList()

◆ qgsEnumMap()

◆ qgsEnumValueToKey()

◆ qgsFlagKeysToValue()

◆ qgsFlagValueToKeys()

◆ qgsFloatNear()

◆ qgsFree()

◆ qgsMalloc()

◆ qgsMapJoinKeys()

◆ qgsMapJoinValues()

◆ qgsNanCompatibleEquals()

◆ qgsNumberNear()

◆ qgsPermissiveToDouble()

◆ qgsPermissiveToInt()

◆ qgsPermissiveToLongLong()

◆ qgsRound()

◆ qgsSetJoin()

◆ qgsVariantEqual()

◆ qgsVariantGreaterThan()

◆ qgsVariantLessThan()

◆ qgsVsiPrefix()

◆ qHash()

◆ whileBlocking()

Variable Documentation

◆ DEFAULT_LINE_WIDTH

◆ DEFAULT_POINT_SIZE

◆ DEFAULT_SEGMENT_EPSILON

◆ GEO_EPSG_CRS_ID

◆ GEOCRS_ID

◆ GEOSRID

◆ USER_CRS_START_ID