C++ named requirements: UniformRandomBitGenerator (since C++11)
A uniform random bit generator is a function object returning unsigned integer values such that each value in the range of possible results has (ideally) equal probability.
Uniform random bit generators are not intended to be used as random number generators: they are used as the source of random bits (generated in bulk, for efficiency). Any uniform random bit generator may be plugged into any random number distribution in order to obtain a random number (formally, a random variate).
Contents |
[edit] Requirements
The type G
satisfies UniformRandomBitGenerator if
Given g, a value of type
|
(until C++20) |
Expression | Type | Requirements |
---|---|---|
G::min() | G::result_type
|
|
G::max() | G::result_type
|
|
g() | G::result_type
|
|
All following conditions are satisfied:
|
(since C++20) |
[edit] Notes
All RandomNumberEngines satisfy this requirement.
[edit] Standard library
The following standard library facilities expect a UniformRandomBitGenerator type.
(until C++17)(C++11) |
randomly re-orders elements in a range (function template) |
(C++17) |
selects N random elements from a sequence (function template) |
(C++11) |
evenly distributes real values of given precision across [ 0, 1) (function template) |
(C++11) |
produces integer values evenly distributed across a range (class template) |
(C++11) |
produces real values evenly distributed across a range (class template) |
all other random number distributions |
The following standard library facilities satisfy UniformRandomBitGenerator without additionally satisfying RandomNumberEngine:
(C++11) |
non-deterministic random number generator using hardware entropy source (class) |
[edit] See also
(C++20) |
specifies that a type qualifies as a uniform random bit generator (concept) |