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37 lines
940 B
37 lines
940 B
#pragma once
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#include "../common.h"
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#include "../rng.h"
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#include "../mem.h"
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namespace rng
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{
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struct crand final : public Random
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{
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// This range is inclusive
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constexpr static inline i64 RANGE_MIN = - (1L << 31);
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constexpr static inline i64 RANGE_MAX = (1L << 31) - 1;
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crand();
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crand(u64 seed);
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inline ~crand(){}
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inline i64 next_i64() override { return _sample_raw(); }
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u64 next_u64() override;
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protected:
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inline constexpr i64 _max_i64() const override { return RANGE_MAX; }
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inline constexpr u64 _max_u64() const override { return (u64)RANGE_MAX; }
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// the rest of the base `_max_*` functions are valid, as they will always be equal to or less than INT32_MAX (the upper bound of dr48.)
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f64 _sample() override;
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private:
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struct _opaque;
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struct _deleter { static void delete_object(_opaque** st); };
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mem::aligned_ptr<_opaque, _deleter> _state;
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explicit crand(_opaque* raw);
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i64 _sample_raw();
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};
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}
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