84 lines
2.5 KiB
C++
Executable File
84 lines
2.5 KiB
C++
Executable File
/* boost random/uniform_real.hpp header file
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*
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* Copyright Jens Maurer 2000-2001
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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: uniform_real.hpp 47233 2008-07-08 16:22:46Z steven_watanabe $
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*
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* Revision history
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* 2001-04-08 added min<max assertion (N. Becker)
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* 2001-02-18 moved to individual header files
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*/
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#ifndef BOOST_RANDOM_UNIFORM_REAL_HPP
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#define BOOST_RANDOM_UNIFORM_REAL_HPP
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#include <cassert>
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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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// uniform distribution on a real range
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template<class RealType = double>
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class uniform_real
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{
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public:
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typedef RealType input_type;
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typedef RealType result_type;
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explicit uniform_real(RealType min_arg = RealType(0),
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RealType max_arg = RealType(1))
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: _min(min_arg), _max(max_arg)
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{
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
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BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer);
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#endif
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assert(min_arg <= max_arg);
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}
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// compiler-generated copy ctor and assignment operator are fine
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; }
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; }
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void reset() { }
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template<class Engine>
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result_type operator()(Engine& eng) {
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return static_cast<result_type>(eng() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
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/ static_cast<result_type>(eng.max BOOST_PREVENT_MACRO_SUBSTITUTION() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
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* (_max - _min) + _min;
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}
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#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(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 uniform_real& ud)
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{
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os << ud._min << " " << ud._max;
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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, uniform_real& ud)
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{
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is >> std::ws >> ud._min >> std::ws >> ud._max;
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return is;
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}
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#endif
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private:
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RealType _min, _max;
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};
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} // namespace boost
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#endif // BOOST_RANDOM_UNIFORM_REAL_HPP
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