case (C++)

[アーティクル]
01/03/2018

The latest version of this topic can be found at case (C++).

Used with the switch_type attribute in a union.

Syntax

  
      [ case(  
   value  
) ]

Parameters

value
A possible input value for which you want to provide processing. The type of value can be one of the following types:

int
char
boolean
enum

or an identifier of such a type.

Remarks

The case C++ attribute has the same functionality as the case MIDL attribute. This attribute is only used with the switch_type attribute.

Example

The following code shows a use of the case attribute:

// cpp_attr_ref_case.cpp  
// compile with: /LD  
#include <unknwn.h>  
[export]  
struct SizedValue2 {  
   [switch_type(char), switch_is(kind)] union {  
      [case(1), string]  
          wchar_t* wval;  
      [default, string]  
          char* val;  
   };  
    char kind;  
};  
[module(name="ATLFIRELib")];

Requirements

Attribute Context

Applies to	Member of a class or `struct`
Repeatable	No
Required attributes	None
Invalid attributes	None

For more information about the attribute contexts, see Attribute Contexts.

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