53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/* example ex3a/ex3a.cpp
|
|
*
|
|
* @author Roland Conybeare, Jul 2026
|
|
*
|
|
* xo-ppsink port of xo-indentlog/example/ex3, slice A: tag / xtag.
|
|
*
|
|
* Same recursion + level-gating + end_scope as ex2, but log arguments are
|
|
* now key/value tags (tag("n", n), xtag("retval", retval)) instead of ad-hoc
|
|
* ":n " literals. Color, timestamps, function-name styling and code
|
|
* location (the rest of ex3) arrive in later slices ex3b..ex3d.
|
|
*/
|
|
|
|
#include <xo/ppsink/scope.hpp>
|
|
#include <xo/ppsink/scope_macros.hpp>
|
|
#include <xo/ppsink/tag.hpp>
|
|
|
|
using xo::pp::scope;
|
|
using xo::pp::scope_config;
|
|
using xo::pp::log_level;
|
|
using xo::pp::tag;
|
|
using xo::pp::xtag;
|
|
|
|
int
|
|
fib(int n) {
|
|
scope log(XO_ENTER0_(info), tag("n", n));
|
|
|
|
int retval = 1;
|
|
|
|
if (n >= 2) {
|
|
retval = fib(n - 1) + fib(n - 2);
|
|
}
|
|
|
|
log.end_scope(tag("n", n), " <-", xtag("retval", retval));
|
|
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
main(int argc, char ** argv) {
|
|
scope_config::min_log_level = log_level::info;
|
|
scope_config::indent_width = 4;
|
|
|
|
int n = 3;
|
|
|
|
scope log(XO_ENTER0_(info), tag("n", n));
|
|
|
|
int fn = fib(n);
|
|
|
|
log && log(tag("n", n));
|
|
log && log("<-", xtag("fib(n)", fn));
|
|
}
|
|
|
|
/* end ex3a.cpp */
|