11b42569fc
* Alphabetically sorted includes. * Updated copyright and license text to match across all files. * Removed pragma once define in header files in lieu of ifdef guards.
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
// Copyright (c) rAthena Dev Teams - Licensed under GNU GPL
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// For more information, see LICENCE in the main folder
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#include "random.hpp"
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#include <random>
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std::mt19937 generator;
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std::uniform_int_distribution<int32> int31_distribution;
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std::uniform_int_distribution<uint32> uint32_distribution;
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/// Initializes the random number generator
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void rnd_init( void ){
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std::random_device device;
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generator = std::mt19937( device() );
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int31_distribution = std::uniform_int_distribution<int32>( 0, SINT32_MAX );
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uint32_distribution = std::uniform_int_distribution<uint32>( 0, UINT32_MAX );
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}
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/// Generates a random number in the interval [0, SINT32_MAX]
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int32 rnd( void ){
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return int31_distribution( generator );
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}
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/// Generates a random number in the interval [0, UINT32_MAX]
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uint32 rnd_uint32( void ){
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return uint32_distribution( generator );
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}
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/// Generates a random number in the interval [0.0, 1.0)
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/// NOTE: interval is open ended, so 1.0 is excluded
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double rnd_uniform( void ){
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return rnd_uint32() * ( 1.0 / 4294967296.0 );// divided by 2^32
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}
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/// Generates a random number in the interval [min, max]
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/// Returns min if range is invalid.
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int32 rnd_value( int32 min, int32 max ){
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if( min >= max ){
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return min;
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}
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return min + (int32)( rnd_uniform() * ( max - min + 1 ) );
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}
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