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61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <cstddef>
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#include <type_traits>
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#include "base/bytes.h"
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namespace base {
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void RandomFill(bytes::span bytes);
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inline void RandomFill(void *data, std::size_t length) {
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RandomFill({ static_cast<bytes::type*>(data), length });
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}
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template <
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typename T,
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typename = std::enable_if_t<std::is_trivially_copyable_v<T>>>
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[[nodiscard]] inline T RandomValue() {
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auto result = T();
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RandomFill({ reinterpret_cast<std::byte*>(&result), sizeof(T) });
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return result;
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}
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[[nodiscard]] int RandomIndex(int count);
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template <typename T>
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class BufferedRandom final {
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public:
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explicit BufferedRandom(int bufferSize) : _buffer(bufferSize) {
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Expects(bufferSize > 0);
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}
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[[nodiscard]] T next() {
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if (_index == _buffer.size()) {
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_index = 0;
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}
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if (!_index) {
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RandomFill(bytes::make_span(_buffer));
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}
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return _buffer[_index++];
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}
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private:
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std::vector<T> _buffer;
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int _index = 0;
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};
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[[nodiscard]] int RandomIndex(int count, BufferedRandom<uint32> buffered);
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void RandomAddSeed(bytes::const_span bytes);
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} // namespace base
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