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This column is motivated by an email that was recently sent to us.
A C++ programmer who had recently received the latest version of
his C++ compiler was puzzled because he was no longer able to use
pointers to extern "C" functions and pointers to C++ functions
interchangeably. Was this a bug in the new compiler or was this a
new feature of Standard C++? And if this was a new feature of Standard
C++, how could he work around it? The short answer to the first
question is that yes, in Standard C++, pointers to C functions and
pointers to C++ functions can no longer be used interchangeably. In
this column, we examine the consequences of this new language rule
more closely.
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