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
|(Specified by the Unicode standard)|
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.
|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.|