Add 'xo-indentlog/' from commit 'd43c4af0b4'

git-subtree-dir: xo-indentlog
git-subtree-mainline: 1c3f033933
git-subtree-split: d43c4af0b4

xo-indentlog/example/ex2/ex2.cpp

@@ -0,0 +1,36 @@
+/* examples ex2/ex2.cpp */
+
+#include "xo/indentlog/scope.hpp"
+
+using namespace xo;
+
+int
+fib(int n) {
+    scope log(XO_ENTER0(info), ":n ", n);
+
+    int retval = 1;
+
+    if (n >= 2) {
+        retval = fib(n - 1) + fib(n - 2);
+        log && log(":n ", n);
+    }
+
+    log.end_scope("<- :retval ", retval);
+
+    return retval;
+}
+
+int
+main(int argc, char ** argv) {
+    log_config::min_log_level = xo::log_level::info;
+    log_config::indent_width = 4;
+
+    int n = 4;
+
+    scope log(XO_ENTER0(info), ":n ", 4);
+
+    int fn = fib(n);
+
+    log && log(":n ", n);
+    log && log("<- :fib(n) ", fn);
+}