Call C++ function from C

[tathanhdinh]

Dear all
I have a problem with calling C++ function from C. I have two seperate
library, one in C and other in C++. The C project could only compile
with C compiler (gcc) (When I compile with g++, the result is tons of
errors). But now I have to call some function of C++ library from C
library.
Example:
// In C++ library
foo() { /* ... */ }

// In C project
bar() { foo(); }

As far as I know, create header for foo (in C++ library):
// foo.h
extern "C" foo();
// ...

Include foo.h in C library and the problem is: I must compile C library
in gcc and link to C++, but the compiler doesn't work.
Please give me some ideas. Thanks.

 

[Ian Collins]

Dear all
I have a problem with calling C++ function from C. I have two seperate
library, one in C and other in C++. The C project could only compile
with C compiler (gcc) (When I compile with g++, the result is tons of
errors). But now I have to call some function of C++ library from C
library.
Example:
// In C++ library
foo() { /* ... */ }

// In C project
bar() { foo(); }

As far as I know, create header for foo (in C++ library):
// foo.h
extern "C" foo();
// ...

Use conditional wrappers:

#ifdef __cplusplus
extern "C" {
#endif

void foo();

#ifdef __cplusplus
}
#endif

Include foo.h in C library and the problem is: I must compile C library
in gcc and link to C++, but the compiler doesn't work.

The compiler works fine, the problem's with your code!

 

[Philip Potter]

Use conditional wrappers:

#ifdef __cplusplus
extern "C" {
#endif

void foo();

#ifdef __cplusplus
}
#endif

In code which may be compiled as C, void foo(void); is better style, since
void foo(); doesn't specify parameter types in C.

Philip