print_once

void  print_once(string msg, ...)

Prints the string passed to the function exactly one time, even in a loop. This is useful to print a message before the first iteration of a loop, without having to count iterations.

msg

The string to print. This string does support interpolating values. Use sprintf to generate the msg string if you need to include values.

“global”, int =0

Normally, multiple instances of print_once() call sites will work independently of each other. That is, if two separate call sites to print_once() are passed the same string, the string will be printed twice (once per call site). With the “global” flag turned on, strings are checked across all instances of the print_once() functions.

Examples

examples

// Only print "Hello world" one time
for (int i = 0; i < 100; ++i)
    print_once("Hello world\n");

// Print a missing texture warning, just one time across all shaders
print_once( sprintf("Missing texture map: %s\n", texture_map), "global", 1);