Diagnostic 357: only nonstatic member functions may be virtual

Cause:

A virtual function cannot be a static member, since a virtual function call relies on a specific object (base or derived) for determining which function to invoke (note: ISO C++ standard); whereas Static functions are object independent.

Default type of this diagnostic is warning. (Microsoft* Visual C++*'s equivalent  warning is C4526.)

Example:

class base {
virtual void  foo( int ) = 0;
};

class derived: public base {  
static void  foo( int ); // generates warning 357
};

 >>icl   /c   t.cpp
Intel(R) C++ Compiler Professional for applications running on IA-32, Version 11
.0    Build 20080916 Package ID: w_cproc_p_11.0.061
Copyright (C) 1985-2008 Intel Corporation.  All rights reserved.

t.cpp
t.cpp(11): warning #357: only nonstatic member functions may be virtual
  static void  foo( int );
                     ^

Possible resolution:

• Remove the static qualifier.
• Rename the static function name in derived class, i.e. rename "foo" to "bar".

   

For more complete information about compiler optimizations, see our Optimization Notice.

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