122 lines
3.8 KiB
C++
Executable File
122 lines
3.8 KiB
C++
Executable File
/* boost random/discard_block.hpp header file
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*
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* Copyright Jens Maurer 2002
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* Distributed under the Boost Software License, Version 1.0. (See
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* accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org for most recent version including documentation.
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*
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* $Id: discard_block.hpp 29116 2005-05-21 15:57:01Z dgregor $
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*
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* Revision history
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* 2001-03-02 created
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*/
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#ifndef BOOST_RANDOM_DISCARD_BLOCK_HPP
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#define BOOST_RANDOM_DISCARD_BLOCK_HPP
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#include <iostream>
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#include <boost/config.hpp>
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#include <boost/limits.hpp>
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#include <boost/static_assert.hpp>
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namespace boost {
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namespace random {
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template<class UniformRandomNumberGenerator, unsigned int p, unsigned int r>
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class discard_block
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{
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public:
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typedef UniformRandomNumberGenerator base_type;
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typedef typename base_type::result_type result_type;
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BOOST_STATIC_CONSTANT(bool, has_fixed_range = false);
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BOOST_STATIC_CONSTANT(unsigned int, total_block = p);
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BOOST_STATIC_CONSTANT(unsigned int, returned_block = r);
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
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BOOST_STATIC_ASSERT(total_block >= returned_block);
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#endif
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discard_block() : _rng(), _n(0) { }
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explicit discard_block(const base_type & rng) : _rng(rng), _n(0) { }
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template<class It> discard_block(It& first, It last)
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: _rng(first, last), _n(0) { }
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void seed() { _rng.seed(); _n = 0; }
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template<class T> void seed(T s) { _rng.seed(s); _n = 0; }
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template<class It> void seed(It& first, It last)
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{ _n = 0; _rng.seed(first, last); }
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const base_type& base() const { return _rng; }
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result_type operator()()
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{
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if(_n >= returned_block) {
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// discard values of random number generator
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for( ; _n < total_block; ++_n)
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_rng();
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_n = 0;
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}
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++_n;
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return _rng();
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}
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (_rng.min)(); }
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (_rng.max)(); }
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static bool validation(result_type x) { return true; } // dummy
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#ifndef BOOST_NO_OPERATORS_IN_NAMESPACE
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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template<class CharT, class Traits>
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friend std::basic_ostream<CharT,Traits>&
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operator<<(std::basic_ostream<CharT,Traits>& os, const discard_block& s)
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{
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os << s._rng << " " << s._n << " ";
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return os;
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}
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template<class CharT, class Traits>
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friend std::basic_istream<CharT,Traits>&
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operator>>(std::basic_istream<CharT,Traits>& is, discard_block& s)
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{
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is >> s._rng >> std::ws >> s._n >> std::ws;
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return is;
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}
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#endif
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friend bool operator==(const discard_block& x, const discard_block& y)
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{ return x._rng == y._rng && x._n == y._n; }
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friend bool operator!=(const discard_block& x, const discard_block& y)
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{ return !(x == y); }
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#else
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// Use a member function; Streamable concept not supported.
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bool operator==(const discard_block& rhs) const
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{ return _rng == rhs._rng && _n == rhs._n; }
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bool operator!=(const discard_block& rhs) const
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{ return !(*this == rhs); }
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#endif
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private:
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base_type _rng;
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unsigned int _n;
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};
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#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
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// A definition is required even for integral static constants
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template<class UniformRandomNumberGenerator, unsigned int p, unsigned int r>
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const bool discard_block<UniformRandomNumberGenerator, p, r>::has_fixed_range;
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template<class UniformRandomNumberGenerator, unsigned int p, unsigned int r>
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const unsigned int discard_block<UniformRandomNumberGenerator, p, r>::total_block;
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template<class UniformRandomNumberGenerator, unsigned int p, unsigned int r>
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const unsigned int discard_block<UniformRandomNumberGenerator, p, r>::returned_block;
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#endif
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} // namespace random
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} // namespace boost
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#endif // BOOST_RANDOM_DISCARD_BLOCK_HPP
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