CODEWITHSUNDEEP
c++stringiteratortype-conversion
infinitezero
infinitezero

Reputation: 2077

Convert string::iterator to std::string

Now this is a little confusing for me, but std::string::iterator actually yields a char (as revealed by typeid). I need it as a string though. How can I do this?

#include <string>
#include <iterator>

int main(){
    std::string str = "Hello World!";
    for( std::string::iterator it = str.begin(); it != str.end(); it++ ){
        std::string expectsString(*it); // error
        std::string expectsString(""+*it); // not expected result
        myFunction(expectsString);
    }
}

I'm using gcc 5.4.0 with C++11 enabled.

edit: As this needs further clarification I want to convert *it to a string. So I can use the currently iterated through character as a string, instead of a char. As my failed examples in the above code example demonstrate, I was looking for something like

std::string myStr = *it; //error

Upvotes: 2

Views: 15767

Answers (5)

Arpan Saini
Arpan Saini

Reputation: 5181

You can declare the string and later can use that for storing *it to that string and can use, which you can use as string anywhere.

std::string el;

 list <std::string> :: iterator it;

 for(it = variableOrder.begin(); it != variableOrder.end(); it++){
                el = *it;
            
                cout << el << endl;
            }

Upvotes: 0

Jarod42
Jarod42

Reputation: 217115

Another alternatives:

std::string expectsString{*it};   // Use initializer_list<char>
std::string expectsString({*it}); // Use initializer_list<char>

Demo

Upvotes: 1

Killzone Kid
Killzone Kid

Reputation: 6240

Could also construct string of length 1 from it using range constructor

std::string expectsString(it, it+1);

Upvotes: 3

Cheers and hth. - Alf
Cheers and hth. - Alf

Reputation: 145224

std::string expectsString{ *it };

Upvotes: 3

Vlad from Moscow
Vlad from Moscow

Reputation: 310930

Use instead

std::string expectsString(1, *it);

Here is a demonstrative program

#include <iostream>
#include <string>

int main() 
{
    std::string str = "Hello World!";

    for( std::string::iterator it = str.begin(); it != str.end(); it++ )
    {
        std::string expectsString( 1, *it );
        std::cout << expectsString;
    }

    std::cout << std::endl;

    return 0;
}

Its output is

Hello World!

Upvotes: 4

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