if(*Token_Iter == "LIGHT")
{
++Token_Iter;
if(*Token_Iter == "ON")
Device->LightEnable(0, true);
if(*Token_Iter == "OFF")
Device->LightEnable(0, false);
};
Boost Tokenizor
Author
Hey, I have a std::string inputted by the user and I use the Boost Tokenizor to iterate through it. It is for a console so say the syntax of a command is
LIGHT [ ON || OFF ]
There is obviously an error however when someone just inputs LIGHT with nothing else after it. Here is my code:
We probably have to see more code, but you should be checking that the iterator is not == end.
[edit] I don't think the error is with ++Token_Iter;. Rather, I think it is due to if(*Token_Iter == "ON") with Token_Iter at the end. How do you set up your Token_Iterator?
[edit2] Here is an example of how it should look like:
[Edited by - jflanglois on May 20, 2006 3:35:29 AM]
[edit] I don't think the error is with ++Token_Iter;. Rather, I think it is due to if(*Token_Iter == "ON") with Token_Iter at the end. How do you set up your Token_Iterator?
[edit2] Here is an example of how it should look like:
#include <iostream>#include <string>#include <boost/token_iterator.hpp>int main() { std::string s; std::getline( std::cin, s ); typedef boost::token_iterator_generator< boost::char_separator< char > >::type TokenIter; boost::char_separator< char > sep( " \t" ); TokenIter it = boost::make_token_iterator< std::string >( s.begin(), s.end(), sep ); TokenIter end = boost::make_token_iterator< std::string >( s.end(), s.end(), sep ); if( it != end ) { if( *it == "LIGHT" ) { if( ++it != end ) { if( *it == "ON" ) Device->LightEnable(0, true); else if( *it == "OFF" ) Device->LightEnable(0, false); } else { std::cerr << "Invalid syntax: should be LIGHT [ ON || OFF ]" << std::endl; } } else if( *it == "STATUS" ) { // et cetera, ad nauseam std::cout << "Ughh, I don't feel good." << std::end; } else std::cerr << "Unknown command" << std::endl; } // Could give an error about no command, // but what self-respecting command line would do that?}[Edited by - jflanglois on May 20, 2006 3:35:29 AM]
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