How can I use the compile time constant __LINE__ in a string?

Question

I can use __LINE__ as a method parameter just fine, but I would like an easy way to use it in a function that uses strings.

For instance say I have this:

Answer 1

sprintf(newStringBuffer, "myTest line %d: testcondition failed\n", __LINE__);

should do it c style. I know that there are ways and ways of doing this with the C++ string libraries.

You could also use strcat() or strncat or any other number of C libs to do this.

cout <<"String" + __LINE__ + " another string" 

will work as well.