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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Compiler warning (level 1) C4072
 
     'function' : no function prototype on _fastcall function
 
     A _fastcall function was called without first being prototyped.
 
     Functions that are _fastcall should be prototyped to guarantee
     that the registers assigned at each point of call are the same as
     the registers assumed when the function is defined. A function
     defined in the new ANSI style is a prototype.
 
     A prototype must be added when this warning appears, unless the
     function takes no arguments or takes only arguments that cannot be
     passed in the general-purpose registers.
                                    -♦-