uniform_int_distribution

Overview

This is a random number distribution class that generates sequences of pseudo-random numbers from pseudo-random number engines.

Details

Syntax

//IntType:A integer type.
template <class IntType = int> 
class uniform_int_distribution;

member types

Following properties are defined.

Name	Definition
uint_least32_t result_type	The type of the numbers generated.
param_type	The type returned by param method.

Constructor

Name	Description
uniform_int_distribution (result_type a = 0, result_type b = numeric_limits<result_type>::max()) uniform_int_distribution (const param_type& parm)	Constructs a uniform_int_distribution object, and initializes its internal state value: Constructs based on the lower bound a and upper bound b. Constructs based on the param input. Example //1 uniform_int_distribution<long> di(1,100); uniform_int_distribution<> di2(1,100); //2 uniform_int_distribution<long> di3(di.param()); uniform_int_distribution<> di4(di2.param());

Methods

Name	Description
result_type min()	Returns the lower bound  of the returned value. i.e., a Example uniform_int_distribution<int> di(1,100); //prints 1 cout << di.min() << endl;
result_type max()	Returns the upper bound  of the returned value. i.e., b Example uniform_int_distribution<int> di(1,100); //prints 100 cout << di.max() << endl;
param_type param() void param (const param_type& parm)	Returns an object with the parameters currently associated with the distribution object. Associates the parameters in object parm to the distribution object. Example uniform_int_distribution<int> di(1,100); //1 auto p = di.param(); //2 uniform_int_distribution<int> di2; di2.param(p);
result_type operator() (URNG& g) result_type operator() (URNG& g, const param_type& parm)	Generates random numbers that are distributed according to the associated probability function. The entropy is acquired by calling g.operator(). Uses the associated parameter set Uses params. The associated parameter set is not modified. Example default_random_engine g(20160921); //1 uniform_int_distribution<int> di(1,100); //prints 79 cout << di(g) << endl; //2 uniform_int_distribution<int> di2; //prints 96 cout << di2(g,di.param()) << endl;
void reset()	Resets the distribution, so that subsequent uses of the object do not depend on values already produced by it.
result_type  a()	Returns lower bound of the distribution parameter. Example uniform_int_distribution<int> di(1,100); //prints 1 cout << di.a() << endl;
result_type b()	Returns upper bound of the distribution parameter. Example uniform_int_distribution<int> di(1,100); //prints 100 cout << di.b() << endl;

External Methods

Name	Description
ostream& operator<< (ostream& os, const  uniform_int_distribution& di )	Saves internal state of di to os. Example uniform_int_distribution<int> di(1,100); stringstream ss; ss << di; //prints 1 100 cout << di << endl;
istream& operator>> (istream&  is, uniform_int_distribution& di )	Restores internal state of di from is.  Example uniform_int_distribution<int> di(1,100); stringstream ss; ss << di; //prints 1 100 cout << di << endl; //prints 1 100 ss >> di; cout << di << endl;
bool operator== (const uniform_int_distribution&  di,  const  uniform_int_distribution& di2)	Returns true if di and di2 are the same.
bool operator!= (const  uniform_int_distribution& di, const  uniform_int_distribution& di2)	Returns true if di and di2 are not the same.