Fundamental types (C++/CX)

In addition to the standard C++ built-in types, C++/CX supports the type system that's defined by the Windows Runtime architecture by providing typedefs for the Windows Runtime fundamental types that map to standard C++ types.. C++/CX implements Boolean, character, and numeric fundamental types. These typedefs are defined in the default namespace, which never needs to be specified explicitly. In addition, C++/CX provides wrappers and concrete implementations for certain Windows Runtime types and interfaces.

Boolean and Character Types

The following table lists the built-in Boolean and character types, and their standard C++ equivalents.

Namespace	C++/CX name	Definition	Standard C++ name	Range of Values
Platform	Boolean	An 8-bit Boolean value.	bool	true (nonzero) and false (zero)
default	char16	A 16-bit non-numeric value that represents a Unicode (UTF-16) code point.	wchar_t -or- L'c'	(Specified by the Unicode standard)

Numeric types

The following table lists the built-in numeric types. The numeric types are declared in the default namespace and are typedefs for the corresponding C++ built-in type. Not all C++ built-in types (long, for example) are supported in the Windows Runtime. For consistency and clarity, we recommend that you use the C++/CX name.

C++/CX name	Definition	Standard C++ name	Range of Values
int8	An 8-bit signed numeric value.	signed char	-128 through 127
uint8	An 8-bit unsigned numeric value.	unsigned char	0 through 255
int16	A 16-bit signed integer.	short	-32,768 through 32,767
uint16	A 16-bit unsigned integer.	unsigned short	0 through 65,535
int32	A 32-bit signed integer.	int	-2,147,483,648 through 2,147,483,647
uint32	A 32-bit unsigned integer.	unsigned int	0 through 4,294,967,295
int64	A 64-bit signed integer.	long long -or- __int64	-9,223,372,036,854, 775,808 through 9,223,372,036,854,775,807
uint64	A 64-bit unsigned integer.	unsigned long long -or- unsigned __int64	0 through 18,446,744,073,709,551,615
float32	A 32-bit IEEE 754 floating-point number.	float	3.4E +/- 38 (7 digits)
float64	A 64-bit IEEE 754 floating-point number.	double	1.7E +/- 308 (15 digits)

Windows Runtime Types

The following table lists some additional types that are defined by the Windows Runtime architecture and are built into C++/CX. Object and String are reference types. The others are value types. All of these types are declared in the Platform namespace. For a full list, see Platform namespace.

Name	Definition
Object	Represents any Windows Runtime type.
String	A series of characters that represent text.
Rect	A set of four floating-point numbers that represent the location and size of a rectangle.
SizeT	An ordered pair of floating-point numbers that specify a height and width.
Point	An ordered pair of floating-point x-coordinates and y-coordinates that define a point in a two-dimensional plane.
Guid	A 128-bit non-numeric value that is used as a unique identifier.
UIntPtr	(For internal use only.) An unsigned 64-bit value that is used as a pointer.
IntPtr	(For internal use only.) A signed 64-bit value that is used as a pointer.

See also

Type System