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range (C++)

  • Artikkel

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

Syntax

[ range(low, high) ]

Parameters

low
The low range value.

high
The high range value.

Remarks

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

Example

// 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);
};

Requirements

Attribute context Value
Applies to Interface method, interface parameter
Repeatable No
Required attributes None
Invalid attributes None

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

See also

IDL Attributes
Method Attributes
Parameter Attributes
Data Member Attributes