What is good practice for generating verbose output?

Question

what is good practice for generating verbose output? currently, i have a function

bool verbose;
int setVerbose(bool v)
{
    errormsg = \"\";
    verbose = v;
           


        

Answer 1

int threshold = 3;
class mystreambuf: public std::streambuf
{
};
mystreambuf nostreambuf;
std::ostream nocout(&nostreambuf);
#define log(x) ((x >= threshold)? std::cout : nocout)

int main()
{
    log(1) << "No hello?" << std::endl;     // Not printed on console, too low log level.
    log(5) << "Hello world!" << std::endl;  // Will print.
    return 0;
}