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