[Assorted-commits] SF.net SVN: assorted:[1214] sandbox/trunk/src/cc/conversions.cc

[<yan...@us...>]

Revision: 1214
          http://assorted.svn.sourceforge.net/assorted/?rev=1214&view=rev
Author:   yangzhang
Date:     2009-02-21 23:55:46 +0000 (Sat, 21 Feb 2009)

Log Message:
-----------
updated conversions with -Wconversion demo

Modified Paths:
--------------
    sandbox/trunk/src/cc/conversions.cc

Modified: sandbox/trunk/src/cc/conversions.cc
===================================================================
--- sandbox/trunk/src/cc/conversions.cc	2009-02-21 09:01:45 UTC (rev 1213)
+++ sandbox/trunk/src/cc/conversions.cc	2009-02-21 23:55:46 UTC (rev 1214)
@@ -1,6 +1,7 @@
 // Demo of conversions.
 
 #include <iostream>
+#include <cstdlib>
 #include <string>
 
 using namespace std;
@@ -34,5 +35,16 @@
   // C++ decides the "best" function to call by ranking all the possible calls. Standard conversions rank better than user-defined conversions, so #1 is called. 
   f(string("hello"));
   f("hello");
+
+  long long l = 0;
+  // Enable -Wconversion, and you'll get:
+  //
+  // warning: conversion to ‘double’ from ‘long long int’ may alter its value
+  //
+  // Must explicitly convert the latter l with double(l).
+  //
+  // double d = double(l) * 1000 / l;
+  double d = double(l) * 1000 / double(l);
+  cout << d << endl;
 }
 


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