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__declspec(property)

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Category

Modifiers (C++), Keyword Extensions, Storage Class Specifiers (C++)

Syntax

__declspec( property( get=get_func_name ) ) declarator
__declspec( property( put=put_func_name ) ) declarator
__declspec( property( get=get_func_name, put=put_func_name ) ) declarator
Note: The __declspec(property) specifier is supported for compatibility with Microsoft. This page is adapted from the MSDN page for your convenience. For the RAD Studio libraries, use the __property keyword extension for C++Builder.

This attribute can be applied to nonstatic "virtual data members" in a class or structure definition. The compiler treats these "virtual data members" as data members by changing their references into function calls.

When the compiler sees a data member declared with this attribute on the right of a member-selection operator ("." or "->"), it converts the operation to a get or put function, depending on whether such an expression is an l-value or an r-value. In more complicated contexts, such as "+=", a rewrite is performed by doing both get and put.

This attribute can also be used in the declaration of an empty array in a class or structure definition.

Example

 __declspec(property(get=GetX, put=PutX)) int x[];

The above statement indicates that x[] can be used with one or more array indices. In this case:

 i=p->x[a][b];

will be turned into:

 i=p->GetX(a, b);

and

 p->x[a][b] = i;

will be turned into:

 p->PutX(a, b, i);

See also

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