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random-generator.hpp
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random-generator.hpp
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/*
* This file is part of libkazv.
* SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#pragma once
#include <libkazv-config.hpp>
#include <memory>
namespace Kazv
{
class RandomInterface
{
public:
using DataT = unsigned int;
/**
* Construct a RandomInterface using an implementation.
*
* @param obj The random generator implementation.
*
* The implementation obj must be of a movable type and
* must be such that the following
* call is valid, and after that v should contain a random number:
*
* `unsigned int v = obj();`
*/
template<class DeriveT>
RandomInterface(DeriveT obj)
: m_d(std::make_unique<Model<DeriveT>>(std::move(obj)))
{}
/**
* Generate a random number of type DataT.
*
* @return A randomly generated DataT.
*/
DataT operator()() {
return (*m_d)();
}
/**
* Generate a range containing `size` random elements.
*
* RangeT must have a constructor such that
* `RangeT(size, ValueT())` constructs a range of `size`
* elements valued `ValueT()`, where `ValueT` is the value type
* of `RangeT`.
*
* @param size The size of the range to create.
*
* @return A RangeT containing `size` random elements.
*/
template<class RangeT>
RangeT generateRange(std::size_t size) {
using ValueT = std::decay_t<decltype(* (std::declval<RangeT>().begin()))>;
RangeT range(size, ValueT());
return fillRange(std::move(range));
}
/**
* Fill the given range.
*
* @param range The range to fill.
*
* @return A range filled with random elements. Its size will be
* the same as `range`.
*/
template<class RangeT>
RangeT fillRange(RangeT range) {
std::generate(range.begin(), range.end(), [this] { return (*this)(); });
return range;
}
private:
struct Concept
{
virtual ~Concept() = default;
virtual DataT operator()() = 0;
};
template<class DeriveT>
struct Model : public Concept
{
Model(DeriveT obj) : instance(std::move(obj)) {}
~Model() override = default;
DataT operator()() override {
return instance();
}
DeriveT instance;
};
std::unique_ptr<Concept> m_d;
};
/**
* A movable wrapper around std::random_device.
*/
class RandomDeviceGenerator
{
public:
RandomDeviceGenerator() : m_d(std::make_unique<std::random_device>()) {}
auto operator()() { return (*m_d)(); }
private:
std::unique_ptr<std::random_device> m_d;
};
}

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