public member function
<random>

std::normal_distribution::operator()

(1)
template<class URNG>result_type operator()(URNG& g);
(2)
template<class URNG>result_type operator()(URNG& g, const param_type& parm);
Generate random number
Returns a new random number that follows the distribution's parameters associated to the object (version 1) or those specified by parm (version 2).

The generator object (g) supplies uniformly-distributed random integers through its operator() member function. The normal_distribution object transforms the values obtained this way so that successive calls to this member function with the same arguments produce floating-point values that follow a Normal distribution with the appropriate parameters.

Parameters

g
A uniform random number generator object, used as the source of randomness.
URNG shall be a uniform random number generator type, such as one of the standard generator classes.
parm
An object representing the distribution's parameters, obtained by a call to member function param.
param_type is a member type.

Return value

A new random number.
result_type is a member type, defined as an alias of the first class template parameter (RealType).

Example

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// normal_distribution example #include <iostream> #include <chrono> #include <random> int main() { // construct a trivial random generator engine from a time-based seed: unsigned seed = std::chrono::system_clock::now().time_since_epoch().count(); std::default_random_engine generator (seed); std::normal_distribution<double> distribution (0.0,1.0); std::cout << "some Normal-distributed(0.0,1.0) results:" << std::endl; for (int i=0; i<10; ++i) std::cout << distribution(generator) << std::endl; return 0; }

Possible output:
some Normal-distributed(0.0,1.0) results: 1.01253 -1.6811 0.722295 -1.73855 0.0196423 -2.51224 1.37467 0.999222 1.24636 2.02573 


Complexity

Amortized constant (a constant number of invocations of g.operator()).

See also