Is the string empty -- i.e., is it the NULL pointer or does it point to an empty string?

from http://www.johndcook.com/cpp_expm1.html

from http://www.johndcook.com/cpp_expm1.html

Fast approximate cos(x*M_PI) with ~0.1% absolute error.

Fast, approximate sin(x*M_PI) with maximum absolute error of 0.000918954611. Adapted from http://devmaster.net/posts/9648/fast-and-accurate-sine-cosin

Controls whether events will be forwarded to listeners_. Set to false in death test child processes.

Even more radical than clear, free ALL memory associated with the list itself.

Shortcuts for common types

Get the height of the filter