Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
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. |