initialization - C++ curly brace delimited initializer lists -


i'm reading stroustrup's newest c++ book (4th edition) , following example book doesn't throw error.

#include <iostream> using namespace std;  int main(const int argc, const char* argv[]) {    // narrowing conversion.   // according stroustrup, error should happen here   // because curly-brace-delimited initializer    // saves conversions lose information.   // after compiling , running code output 7.   int i2 {7.2};   cout << i2 << endl;    return 0; }

i'm using following command compile code on gentoo system. (g++ version: 4.6.3)

g++ -std=c++0x -o output input.cpp

why doesn't throw error?

a more current version of gcc (4.8.1), treats warning:

trash9.cpp: in function 'int main(int, const char**)': trash9.cpp:11:14: warning: narrowing conversion of '7.2000000000000002e+0' 'double' 'int' inside { } [-wnarrowing]    int i2 {7.2};

the standard requires compiler issue "diagnostic", (with right documentation) undoubtedly qualifies. compiler free continue compiling code afterwards.

vc++ closer apparently want:

trash9.cpp(11) : error c2397: conversion 'double' 'int' requires narro wing conversion

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