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range (C++)

Specifies a range of allowable values for arguments or fields whose values are set at run time.

[ range( 
   low,  
   high 
) ]

low

The low range value.

high

The high range value.

The range C++ attribute has the same functionality as the range MIDL attribute.

// cpp_attr_ref_range.cpp
// compile with: /LD
#include <unknwn.h>
[module(name="MyLib")];

[object, uuid("9E66A290-4365-11D2-A997-00C04FA37DDB")]
__interface ICustom {
   HRESULT Custom([in] long l, [out, retval] long *pLong);
   HRESULT length_is1([in, range(0, 999)] long f, [in, length_is(f)] char array[10]);
   HRESULT length_is2([in, range(-99, -1)] long f, [in, length_is("f"), size_is(10)] char *array);
};

Attribute Context

Applies to

Interface method, interface parameter

Repeatable

No

Required attributes

None

Invalid attributes

None

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

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