switch_type
Identifies the type of the variable used as the union discriminant.
[switch_type(type}]
Parameters
- type
The switch type, can be an integer, character, Boolean, or enumeration type.
Remarks
The switch_type C++ attribute has the same functionality as the switch_type MIDL attribute.
C++ attributes do not support encapsulated unions. Nonencapsulated unions are supported only in the following form:
// cpp_attr_ref_switch_type.cpp
// compile with: /LD
#include <windows.h>
[module(name="MyLibrary")];
[ export ]
struct SizedValue2 {
[switch_type("char"), switch_is(kind)] union {
[case(1), string]
wchar_t* wval;
[default, string]
char* val;
};
char kind;
};
Example
See the case example for a sample use of switch_type.
Requirements
Attribute Context
Applies to |
typedef |
Repeatable |
No |
Required attributes |
None |
Invalid attributes |
None |
For more information about the attribute contexts, see Attribute Contexts.