# std::piecewise_constant_distribution<RealType>::piecewise_constant_distribution

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< cpp‎ | numeric‎ | random‎ | piecewise constant distribution

piecewise_constant_distribution(); | (1) | (since C++11)
template< class InputIt1, class InputIt2 > piecewise_constant_distribution( InputIt1 first_i, InputIt1 last_i, InputIt2 first_w ); | (2) | (since C++11)
template< class UnaryOperation > piecewise_constant_distribution( std::initializer_list<RealType> bl, UnaryOperation fw ); | (3) | (since C++11)
template< class UnaryOperation > piecewise_constant_distribution( std::size_t nw, RealType xmin, RealType xmax, UnaryOperation fw ); | (4) | (since C++11)
explicit piecewise_constant_distribution( const param_type& parm ); | (5) | (since C++11)

Constructs new piecewise constant distribution object.

1) Constructs a distribution object with n = 1, ρ0 = 1, b0 = 0, and b1 = 1.
2) Constructs a distribution object from iterators over the interval sequence `[first_i, last_i)` and a matching weight sequence starting at `first_w`.
3) Constructs a distribution object where the intervals are taken from the initializer list `bl` and the weights generated by the function `fw`.
4) Constructs a distribution object with the `nw` intervals distributed uniformly over `[xmin, xmax]` and the weights generated by the function `fw`.
5) Constructs a distribution object initialized with the parameters `param`.

### Parameters

first_i | - | iterator initialized to the start of the interval sequence
last_i | - | iterator initialized to one-past-the-end of the interval sequence
first_w | - | iterator initialized to the start of the density (weight) sequence
ilist_i | - | initializer_list yielding the interval sequnce
fw | - | double(double) function yielding the densities
nw | - | the number of densities
xmin | - | the lower bound of the interval sequence
xmax | - | the upper bound of the interval sequence
parm | - | the distribution parameter set

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