invalid conversion from 'const char*' to 'char*'

Question

Have a code as shown below. I have problem passing the arguments.

stringstream data;
char *addr=NULL;
strcpy(addr,ret         


        

Answer 1

string::c.str() returns a string of type const char * as seen here

A quick fix: try casting printfunc(num,addr,(char *)data.str().c_str());

While the above may work, it is undefined behaviour, and unsafe.

Here's a nicer solution using templates:

char * my_argument = const_cast ( ...c_str() );