libcruft-util/rand/system_win32.hpp

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/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2019 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include <limits>
#include <string>
namespace cruft::rand {
namespace win32 {
/// Models std::random_device and is suitable as a drop-in replacement.
///
/// This uses the RtlGenRandom function which is currently deprecated.
class rtlgenrandom {
public:
using result_type = unsigned;
rtlgenrandom ();
rtlgenrandom (std::string const&);
rtlgenrandom (rtlgenrandom const &) = delete;
rtlgenrandom& operator= (rtlgenrandom const&) = delete;
result_type operator() (void);
double entropy (void) const noexcept;
static constexpr result_type min (void) { return std::numeric_limits<result_type>::min (); }
static constexpr result_type max (void) { return std::numeric_limits<result_type>::max (); }
};
}
using system = win32::rtlgenrandom;
}