Question

I would like concatenate string literals and ints, like this:
string message("That value should be between " + MIN_VALUE + " and " + MAX_VALUE);

But that gives me this error:

error: invalid operands of types ‘const char*’ and ‘const char [6]’ to binary ‘operator+’|

What is the correct way to do that? I could split that in 2 string declarations (each concatenating a string literal and a int), but that’s ugly. I’ve also tried << operator.

Thanks

Answer 1

You should probably use stringstream for this.

#include <sstream>

std::stringstream s;
s << "This value shoud be between " << MIN_VALUE << " and " << MAX_VALUE;
message = s.str();