72 lines
4.0 KiB
C++
72 lines
4.0 KiB
C++
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/**************************************************************************************/
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/* */
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/* Visualization Library */
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/* http://visualizationlibrary.org */
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/* */
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/* Copyright (c) 2005-2020, Michele Bosi */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without modification, */
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/* are permitted provided that the following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, this */
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/* list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above copyright notice, this */
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/* list of conditions and the following disclaimer in the documentation and/or */
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/* other materials provided with the distribution. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */
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/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */
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/* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */
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/* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/**************************************************************************************/
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#ifndef Random_INCLUDE_ONCE
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#define Random_INCLUDE_ONCE
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#include <vlCore/Object.hpp>
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namespace vl
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{
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//! Cryptographic random number generator.
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//! For non-ryptographic fast and high quality random number generation use vl::MersenneTwister.
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class VLCORE_EXPORT Random: public Object
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{
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VL_INSTRUMENT_CLASS(vl::Random, Object)
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public:
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//! Constructor.
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Random();
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//! Destructor.
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virtual ~Random();
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//! Fills the specified buffer with random data generated using the best quality random number generation facilities available.
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//! Under Windows (including MinGW) \p CryptGenRandom is used, while under Unix-like operating systems \p /dev/urandom is used.
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//! If no special random number generation facility is detected the function falls back to use a MersenneTwister.
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//! \return This method returns \p false if the function had to fallback to MersenneTwister otherwise returns \p true.
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virtual bool fillRandom(void* ptr, size_t bytes) const;
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//! Fills the specified buffer with random data generated using a defMersienneTwister().
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//! MersienneTwister produces high quality random number and can be much faster than fillRandom().
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void fillRandomMersenneTwister(void* ptr, size_t bytes) const;
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private:
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#if defined(_MSC_VER) || defined(__MINGW32__)
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void* hCryptProv;
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#elif defined(__GNUG__) && !defined(__MINGW32__)
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FILE* mDefURandom;
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#endif
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};
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}
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#endif
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