Is there a way to implement analog of Python's 'separator'.join() in C++?

Question

All I\'ve found is boost::algorithm::string::join. However, it seems like overkill to use Boost only for join. So maybe there are some time-tested recipes?

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Answer 1

C++ strings are implemented efficiently.

std::string s = s1 + s2 + s3;

This could be faster:

std::string str;
str.reserve(total_size_to_concat);

for (std::size_t i = 0; i < s.length(); i++)
{
  str.append(s[i], s[i].length());
}

But this is basically what your compiler do with operator+ and a minimum of optimization except it is guessing the size to reserve.
Don't be shy. Take a look at the implementation of strings. :)