Returns type of the reference.

find the first character that is in a given set of characters, from the start of the string Optionally starting at a given 'first' character and not i

returns 1 for either scalar or vector of size 1, valid for both

note - this are all inline so we can benefit from strlen() compile time optimizations

translate from array-of-array semantics to container semantics

Link-time warning.

Absolute value. See also:** Documentation for [std::abs](https://en.cppreference.com/w/cpp/numeric/math/fabs). \param arg operand \return absolute val

Qt-type interface

Signal and silence signaling NaN. \param nan half-precision NaN value \return quiet NaN \exception FE_INVALID if \a nan is signaling NaN

STL style

Nearest integer not greater than half value. See also:** Documentation for [std::floor](https://en.cppreference.com/w/cpp/numeric/math/floor). \param