A uniform random number generator is a function object returning unsigned integer values such that each value in the range of possible results has (ideally) equal probability. Any uniform random number generator may be plugged into any random number distribution.
Requirements
The type G satisfies UniformRandomNumberGenerator if.
Given.
-
T, the type named byG::result_type -
g, a value of typeG
The following expressions must be valid and have their specified effects.
| Expression | Return type | Requirements |
|---|---|---|
G::result_type | T | T is an unsigned integer type |
G::min() | T | Returns the smallest value that G's operator() may return. The value is strictly less than G::max(). |
G::max() | T | Returns the largest value that G's operator() may return. The value is strictly greater than G::min() |
g() | T | Returns a value in the closed interval [G::min(), G::max()]. Has amortized constant complexity. |
Notes
All RandomNumberEngines satisfy this concept.
Standard library
The following standard library facilities expect a UniformRandomNumberGenerator type.
| (until C++17)(C++11) | randomly re-orders elements in a range (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 UniformRandomNumberGenerator without additionally satisfying RandomNumberEngine:
| non-deterministic random number generator using hardware entropy source (class) |
Please login to continue.