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How to connect string and in?

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You have to cast it to a string. Either use boost::lexical_cast or roll your own function.

#include <sstream>

template<typename R, typename T>
R lexical_cast(T const& value) {
R ret;
std::stringstream ss;
ss << value;
ss >> ret;
return ret;}

int ext = 0;
string str = "light";

string s = str + lexical_cast<string,int>(ext++);

It may seem like a lot, but it's a very usefull function to have around.

Edit: beaten :(

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