Common mathematical functions | |||||||||||||||||||||||||||||||
Mathematical special functions(C++17) | |||||||||||||||||||||||||||||||
Mathematical constants(C++20) | |||||||||||||||||||||||||||||||
Basic linear algebra algorithms(C++26) | |||||||||||||||||||||||||||||||
Data-parallel types (SIMD)(C++26) | |||||||||||||||||||||||||||||||
Floating-point environment(C++11) | |||||||||||||||||||||||||||||||
Complex numbers | |||||||||||||||||||||||||||||||
Numeric array (valarray ) | |||||||||||||||||||||||||||||||
Pseudo-random number generation | |||||||||||||||||||||||||||||||
Bit manipulation(C++20) | |||||||||||||||||||||||||||||||
Saturation arithmetic(C++26) | |||||||||||||||||||||||||||||||
Factor operations | |||||||||||||||||||||||||||||||
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Interpolations | |||||||||||||||||||||||||||||||
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Generic numeric operations | |||||||||||||||||||||||||||||||
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C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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Defined in header <random> | ||
class seed_seq; | (since C++11) | |
std::seed_seq
consumes a sequence of integer-valued data and produces a requested number of 32-bit unsigned integer values, based on the consumed data. The produced values are distributed over the entire 32-bit range even if the consumed values are close.
It provides a way to seed a large number of random number engines or to seed a generator that requires a lot of entropy, given a small seed or a poorly distributed initial seed sequence.
std::seed_seq
meets the requirements ofSeedSequence.
Contents |
Type | Definition |
result_type | std::uint_least32_t |
Member | Description |
std::vector<result_type>v | the underlying seed sequence (exposition-only member object*) |
constructs and seeds thestd::seed_seq object(public member function) | |
operator= [deleted] | std::seed_seq is not assignable(public member function) |
calculates the bias-eliminated, evenly distributed 32-bit values (public member function) | |
obtains the number of stored 32-bit values (public member function) | |
copies all stored 32-bit values (public member function) |
#include <cstdint>#include <iostream>#include <random> int main(){ std::seed_seq seq{1,2,3,4,5};std::vector<std::uint32_t> seeds(10); seq.generate(seeds.begin(), seeds.end());for(std::uint32_t n: seeds)std::cout<< n<<'\n';}
Possible output:
4204997637424653386618560490021129615051690460811107577151146783058390410907815341234381495905678