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[alg.rand.generate]
# 26 Algorithms library [[algorithms]](./#algorithms)
## 26.12 Specialized <random> algorithms [[alg.rand]](alg.rand#generate)
### 26.12.2 generate_random [alg.rand.generate]
[🔗](#lib:generate_random)
`template<class R, class G>
requires [output_range](range.refinements#concept:output_range "25.4.6Other range refinements[range.refinements]")<R, invoke_result_t<G&>> && [uniform_random_bit_generator](rand.req.urng#concept:uniform_random_bit_generator "29.5.3.3Uniform random bit generator requirements[rand.req.urng]")<remove_cvref_t<G>>
constexpr borrowed_iterator_t<R> ranges::generate_random(R&& r, G&& g);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14327)
*Effects*:
- [(1.1)](#1.1)
Calls g.generate_random(std::forward<R>(r)) if this expression is well-formed[.](#1.1.sentence-1)
- [(1.2)](#1.2)
Otherwise, if R models [sized_range](range.sized#concept:sized_range "25.4.4Sized ranges[range.sized]"),
fills r with ranges::size(r) values of
type invoke_result_t<G&> by performing
an unspecified number of invocations of
the form g() or g.generate_random(s),
if such an expression is well-formed for a value N and
an object s of type span<invoke_result_t<G&>, N>[.](#1.2.sentence-1)
[*Note [1](#note-1)*:
Values of N can differ between invocations[.](#1.2.sentence-2)
— *end note*]
- [(1.3)](#1.3)
Otherwise, calls ranges::generate(std::forward<R>(r), ref(g))[.](#1.3.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14348)
*Returns*: ranges::end(r)[.](#2.sentence-1)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14352)
*Remarks*: The effects of generate_random(r, g) shall be equivalent toranges::generate(std::forward<R>(r), ref(g))[.](#3.sentence-1)
[*Note [2](#note-2)*:
This implies that g.generate_random(a) fills a with the same values as produced by invocation of g()[.](#3.sentence-2)
— *end note*]
[🔗](#lib:generate_random_)
`template<class G, [output_iterator](iterator.concept.output#concept:output_iterator "24.3.4.10Concept output_­iterator[iterator.concept.output]")<invoke_result_t<G&>> O, [sentinel_for](iterator.concept.sentinel#concept:sentinel_for "24.3.4.7Concept sentinel_­for[iterator.concept.sentinel]")<O> S>
requires [uniform_random_bit_generator](rand.req.urng#concept:uniform_random_bit_generator "29.5.3.3Uniform random bit generator requirements[rand.req.urng]")<remove_cvref_t<G>>
constexpr O ranges::generate_random(O first, S last, G&& g);
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14370)
*Effects*: Equivalent to:return generate_random(subrange<O, S>(std::move(first), last), g);
[🔗](#lib:generate_random__)
`template<class R, class G, class D>
requires [output_range](range.refinements#concept:output_range "25.4.6Other range refinements[range.refinements]")<R, invoke_result_t<D&, G&>> && [invocable](concept.invocable#concept:invocable "18.7.2Concept invocable[concept.invocable]")<D&, G&> &&
[uniform_random_bit_generator](rand.req.urng#concept:uniform_random_bit_generator "29.5.3.3Uniform random bit generator requirements[rand.req.urng]")<remove_cvref_t<G>> &&
is_arithmetic_v<invoke_result_t<D&, G&>>
constexpr borrowed_iterator_t<R> ranges::generate_random(R&& r, G&& g, D&& d);
`
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14388)
*Effects*:
- [(5.1)](#5.1)
Calls d.generate_random(std::forward<R>(r), g) if this expression is well-formed[.](#5.1.sentence-1)
- [(5.2)](#5.2)
Otherwise, if R models [sized_range](range.sized#concept:sized_range "25.4.4Sized ranges[range.sized]"),
fills r with ranges::size(r) values of
type invoke_result_t<D&, G&> by performing an unspecified number of invocations of
the form invoke(d, g) or d.generate_random(s, g),
if such an expression is well-formed
for a value N and
an object s of type span<invoke_result_t<D&, G&>, N>[.](#5.2.sentence-1)
[*Note [3](#note-3)*:
Values of N can differ between invocations[.](#5.2.sentence-2)
— *end note*]
- [(5.3)](#5.3)
Otherwise, callsranges::generate(std::forward<R>(r), [&d, &g] { return invoke(d, g); });
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14413)
*Returns*: ranges::end(r)[.](#6.sentence-1)
[7](#7)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14417)
*Remarks*: The effects of generate_random(r, g, d) shall be equivalent toranges::generate(std::forward<R>(r), [&d, &g] { return invoke(d, g); })
[*Note [4](#note-4)*:
This implies that d.generate_random(a, g) fills a with the values with the same random distribution
as produced by invocation of invoke(d, g)[.](#7.sentence-1)
— *end note*]
[🔗](#lib:generate_random___)
`template<class G, class D, [output_iterator](iterator.concept.output#concept:output_iterator "24.3.4.10Concept output_­iterator[iterator.concept.output]")<invoke_result_t<D&, G&>> O, [sentinel_for](iterator.concept.sentinel#concept:sentinel_for "24.3.4.7Concept sentinel_­for[iterator.concept.sentinel]")<O> S>
requires [invocable](concept.invocable#concept:invocable "18.7.2Concept invocable[concept.invocable]")<D&, G&> && [uniform_random_bit_generator](rand.req.urng#concept:uniform_random_bit_generator "29.5.3.3Uniform random bit generator requirements[rand.req.urng]")<remove_cvref_t<G>> &&
is_arithmetic_v<invoke_result_t<D&, G&>>
constexpr O ranges::generate_random(O first, S last, G&& g, D&& d);
`
[8](#8)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14439)
*Effects*: Equivalent to:return generate_random(subrange<O, S>(std::move(first), last), g, d);