[tools-compilers] A potential problem of Function Pointer as Template Parameter in SS12

[Steve Clamage]

You cannot overload functions on C versus C++ linkage, but different linkages 
are different types.
When you uncomment the first line, the second declaration of foo inherits the C 
linkage from the frist declaration of the same function.
The template is declared to take a pointer to a function with C++ linkage, so 
you cannot instantiate it on a function with C linkage.
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