seed.hpp

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// Copyright Take Vos 2022.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../assert.hpp"
#include "../rapid/numeric_array.hpp"
#include <random>
#include <concepts>
#include <type_traits>
#include <bit>
 
namespace hi::inline v1 {
 
void generate_seed(void *ptr, size_t size);
 
template<typename T>
struct seed {
    [[nodiscard]] T operator()() const
    {
        hi_not_implemented();
    }
 
    [[nodiscard]] T operator()() const requires(std::has_unique_object_representations_v<T> and not std::is_pointer_v<T>)
    {
        auto buffer = std::array<uint8_t, sizeof(T)>{};
        generate_seed(buffer.data(), buffer.size());
        return std::bit_cast<T>(buffer);
    }
};
 
} // namespace hi::inline v1