what's wrong w/ this extraction of integer

[nvrmnd]

Why won't the former code work ?

doesn't work

#include <iostream>
#include <sstream>

int main( int argc, char* args[] )
{
    std::istringstream iss( args[1] );
    
    std::size_t i = 0;
    
    if( !iss >> i ) // <== HERE
        std::cout << "error";
    else
        std::cout << i;
}

works

#include <iostream>
#include <sstream>

int main( int argc, char* args[] )
{
    std::istringstream iss( args[1] );
    
    std::size_t i = 0;
    
    if( iss >> i ) // <== WORKS
        std::cout << i;
    else
        std::cout << "error!";
}

both w/ cmd line arg 10

[cire]

Try if ( !(ss >> i) ).

[modoran]

If are interested why, read this:
http://en.cppreference.com/w/cpp/language/operator_precedence

[nvrmnd]

wow, tnx guys,

why didn't i think of that