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How can I convert int to std :: string in C ++ using MinGW?

Std :: to_string is known not to work. Even std :: itoa didn't work for me. What can I do to convert an int to a string? I don't care about performance, all I need is to work, not too slow.

Edit: I have the latest version of mingw 32 installed, std :: to_string still doesn't work. I installed it here: http://sourceforge.net/projects/mingwbuilds/files/host-windows/releases/4.8.1/32-bit/threads-win32/sjlj/

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2 answers


Are you considering using a string stream?



#include <sstream>

std::string itos(int i){
    std::stringstream ss;
    ss<<i;
    return ss.str();
}
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It took me a few hours to solve this problem, and I ended up writing my own function for myself. This is probably not optimal and could be wrong as I am new to C ++ (this is literally the first useful function I wrote in C ++). However, it passed all the tests I wrote just fine, and performance shouldn't be an issue if the in-string conversion isn't a significant part of your bottleneck.



string itos(int i)
{
    if (i == 0) { return "0"; }
    if (i < 0) { return "-" + itos(-i); }
    // Number of characters needed
    int size = int(log10(i)) + 1;
    char* buffer = (char*)malloc((size + 1) * sizeof(char));
    buffer[size] = NULL;
    for (int j = 0; j < size; j++)
        buffer[j] = (char) ( (int(i / pow(10, (size - j - 1))) % 10) + '0');
    string l(buffer);
    free(buffer);
    return l;
}
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