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

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`help`

Parameter help displays help on the framework's parameters. The parameter accepts an optional argument value:

if present, the argument value is interpreted as a parameter name. Name guessing works as well (so for example --help=rand displays help on the parameter random).
if the parameter name is unknown or ambiguous, an error is reported,
if the argument value is absent, a summary of all framework's parameter is displayed.

Acceptable values

An optional parameter name string.

Command line syntax

--help[=<parameter name>]