Send string as function parameter from Go to C++

[pbandyop]

Hi,
first it is a very nice example.

Your project works fine if I send integer as parameter in my C++ function. I want to send a string from Go to C++ like:
C.Free("hello"))
then what should I define in my header file. Currently, I tried this:

`#ifndef MY_PACKAGE_FOO_H

define MY_PACKAGE_FOO_H

include

ifdef __cplusplus

extern "C" {

endif

cv::string Free(cv::string len);

ifdef __cplusplus

}

endif

endif`

but I get the following error:

could not determine kind of name for C.Free

clang errors for preamble:
In file included from ./foo.go:5:
./foo.h:10:4: error: expected ';' after top level declarator
cv::string Free(cv::string len);
^
;
./foo.h:10:5: error: expected identifier or '('
cv::string Free(cv::string len);
^
2 errors generated.

where cv::string Free(cv::string len); is my only C++ function in my *.cpp file. Could you suggest anything?