Each type instantiated
from a class template specified in this section [rand.dist]
satisfies the requirements
of a random number distribution ([rand.req.dist]) type.
Descriptions are provided in this section [rand.dist]
only for distribution operations
that are not described in [rand.req.dist]
or for operations where there is additional semantic information.
In particular,
declarations for copy constructors,
for copy assignment operators,
for streaming operators,
and for equality and inequality operators
are not shown in the synopses.
The value of each probability density function p(z)
and of each discrete probability function P(zi)
specified in this section
is 0
everywhere outside its stated domain.