How to convert std::wstring to std::string

I did not see how I can easily convert wstring in string.
I understand wstring is twice the lenght of string.

In my case all the character is alpha numeric and '.:;/\'
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You could use 'wcstombs()' ( for that purpose, e.g.

wstring wstr = L"The quick brown fox...";
string str;
size_t len = wstr.length() + 1;
char* buf = new char[len]; // allocate temp. buffer

wcstombs(buf,wstr.c_str(),len); // do the conversion

str = buf; // assign to 'std::string'

delete[] buf; // clean up

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PS: You might have guessed that, there's 'mbstowcs()' for the other way round

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