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Normal bf(C) functions, e.g., which are compiled and collected in a run-time
library, can also be used in bf(C++) programs. Such functions, however, must be
declared as bf(C) functions.
As an example, the following code fragment declares a function tt(xmalloc)
as a bf(C) function:
verb( extern "C" void *xmalloc(int size);)
This declaration is analogous to a declaration in bf(C), except that the
prototype is prefixed with ti(extern "C").
A slightly different way to declare bf(C) functions is the following:
verb( extern "C"
{
// C-declarations go in here
})
It is also possible to place preprocessor directives at the location of
the declarations. E.g., a bf(C) header file tt(myheader.h) which declares
bf(C) functions can be included in a bf(C++) source file as follows:
verb( extern "C"
{
#include <myheader.h>
})
Although these two approaches may be used, they are actually seldom
encountered in bf(C++) sources. A more frequently used method to declare
external bf(C) functions is encountered in the next section.
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