...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Returns the number of warnings produced by the executed SQL statement.
unsigned warning_count() const;
For operations returning more than one resultset, returns the first resultset's warning count.
this->has_value()
== true
No-throw guarantee.
Constant.