Defined in header <random>  

template< class RealType = double > class uniform_real_distribution;  (since C++11) 
Produces random floatingpoint values i, uniformly distributed on the interval [a, b)
, that is, distributed according to the probability density function: P(ia,b) =
1 
b − a 
std::uniform_real_distribution
satisfies all requirements of RandomNumberDistribution.
RealType    The result type generated by the generator. The effect is undefined if this is not one of float , double , or long double . 
Member type  Definition 

result_type  RealType 
param_type  the type of the parameter set, see RandomNumberDistribution. 
constructs new distribution (public member function) 

resets the internal state of the distribution (public member function) 

Generation 

generates the next random number in the distribution (public member function) 

Characteristics 

returns the distribution parameters (public member function) 

gets or sets the distribution parameter object (public member function) 

returns the minimum potentially generated value (public member function) 

returns the maximum potentially generated value (public member function) 
compares two distribution objects (function) 

performs stream input and output on pseudorandom number distribution (function template) 
To create a distribution over the closed interval [a,b], std::nextafter(b, std::numeric_limits<RealType>::max())
may be used as the second parameter.
Some existing implementations have a bug where they may occasionally return b if RealType
is float
GCC #63176 LLVM #18767. This is caused by LWG issue 2524
print 10 random numbers between 1 and 2.
#include <random> #include <iostream> int main() { std::random_device rd; //Will be used to obtain a seed for the random number engine std::mt19937 gen(rd()); //Standard mersenne_twister_engine seeded with rd() std::uniform_real_distribution<> dis(1.0, 2.0); for (int n = 0; n < 10; ++n) { // Use dis to transform the random unsigned int generated by gen into a // double in [1, 2). Each call to dis(gen) generates a new random double std::cout << dis(gen) << ' '; } std::cout << '\n'; }
Possible output:
1.80829 1.15391 1.18483 1.38969 1.36094 1.0648 1.97798 1.27984 1.68261 1.57326
© cppreference.com
Licensed under the Creative Commons AttributionShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/numeric/random/uniform_real_distribution