boost::algorithm::trim_left is a Boost std::string algorithm to trim whitespace away from the left side of a std::string.


#include <cassert>

#include <boost/algorithm/string/trim.hpp>



int main()

{

  std::string s = " \t \n x";

  boost::algorithm::trim_left(s);

  assert(s=="x");

}

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(C++) boost::algorithm::trim_left