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

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

xo-indentlog/example/ex4/ex4.cpp

@@ -0,0 +1,52 @@
+/* @file ex4.cpp */
+
+#include "xo/indentlog/scope.hpp"
+
+using namespace xo;
+
+class Quadratic {
+public:
+    Quadratic(double a, double b, double c) : a_{a}, b_{b}, c_{c} {}
+
+    double operator() (double x) const {
+        scope log(XO_ENTER0(info), tag("a", a_), xtag("b", b_), xtag("c", c_), xtag("x", x));
+
+        double retval = (a_ * x * x) + (b_ * x) + c_;
+
+        log.end_scope("<-", xtag("retval", retval));
+
+        return retval;
+    }
+
+private:
+    double a_ = 0.0;;
+    double b_ = 0.0;
+    double c_ = 0.0;
+};
+
+int
+main(int argc, char ** argv) {
+    log_config::style  = function_style::streamlined;
+    log_config::min_log_level = log_level::info;
+
+    scope log(XO_ENTER0(info));
+
+    Quadratic quadratic(2.0, -5.0, 7.0);
+
+    double x = 3.0;
+    double r = 0.0;
+
+    log_config::style  = function_style::pretty;
+
+    r = quadratic(x);
+
+    log_config::style = function_style::streamlined;
+
+    r = quadratic(x);
+
+    log_config::style = function_style::simple;
+
+    r = quadratic(x);
+}
+
+/* end ex4.cpp */