...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::algorithm::trim_left_copy — Left trim - parametric.
template<typename SequenceT> SequenceT trim_left_copy(const SequenceT & Input, const std::locale & Loc = std::locale());