nestlog: + ex2 + expand README.md

README.md

@@ -4,16 +4,16 @@ Nestlog is a lightweight header-only library for console logging.
 
 ## Examples
 
+### 1
+
     /* examples/ex1/ex1.cpp */
 
     #include "nestlog/scope.hpp"
 
-    using namespace xo;
-
     void A(int x) {
-        XO_SCOPE(log)  // i.e. xo::scope log("A");
+        XO_SCOPE(log);  // i.e. xo::scope log("A");
 
-        log(":x ", x);
+        log("enter ", ":x ", x);
     }
 
     int
@@ -24,5 +24,65 @@ Nestlog is a lightweight header-only library for console logging.
 output:
 
     +A
-     :x 66
+     enter :x 66
     -A
+
+### 2
+
+    /* examples ex2/ex2.cpp */
+
+    #include "nestlog/scope.hpp"
+
+     int fib(int n) {
+       XO_SCOPE(log);
+
+       int retval = 1;
+
+       if (n >= 2)
+          retval = fib(n - 1) + fib(n - 2);
+
+       log("result ", ":retval ", retval);
+    }
+
+    int
+    main(int argc, char ** argv) {
+      XO_SCOPE(log);
+
+       int n = 4;
+      int fn = fib(n);
+
+      log(":n ", n, " :fib(n) ", fn);
+    }
+
+output:
+
+    +main
+     +fib
+      +fib
+       +fib
+        +fib
+         result :retval 1
+        -fib
+        +fib
+         result :retval 1
+        -fib
+        result :retval 2
+       -fib
+       +fib
+        result :retval 1
+       -fib
+       result :retval 3
+      -fib
+      +fib
+       +fib
+        result :retval 1
+       -fib
+       +fib
+        result :retval 1
+       -fib
+       result :retval 2
+      -fib
+      result :retval 5
+     -fib
+     :n 4 :fib(n) 5
+    -main