Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the master branch, built from commit a2b80500d6.

Returns the number of warnings for this resultset.

unsigned
warning_count() const noexcept;

this->has_value() == true

No-throw guarantee.

Constant.