diff -r 000000000000 -r bde4ae8d615e os/ossrv/ossrv_pub/boost_apis/boost/random/triangle_distribution.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/random/triangle_distribution.hpp Fri Jun 15 03:10:57 2012 +0200 @@ -0,0 +1,101 @@ +/* boost random/triangle_distribution.hpp header file + * + * Copyright Jens Maurer 2000-2001 + * Distributed under the Boost Software License, Version 1.0. (See + * accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + * + * See http://www.boost.org for most recent version including documentation. + * + * $Id: triangle_distribution.hpp,v 1.11 2004/07/27 03:43:32 dgregor Exp $ + * + * Revision history + * 2001-02-18 moved to individual header files + */ + +#ifndef BOOST_RANDOM_TRIANGLE_DISTRIBUTION_HPP +#define BOOST_RANDOM_TRIANGLE_DISTRIBUTION_HPP + +#include +#include +#include + +namespace boost { + +// triangle distribution, with a smallest, b most probable, and c largest +// value. +template +class triangle_distribution +{ +public: + typedef RealType input_type; + typedef RealType result_type; + + explicit triangle_distribution(result_type a = result_type(0), + result_type b = result_type(0.5), + result_type c = result_type(1)) + : _a(a), _b(b), _c(c) + { + assert(_a <= _b && _b <= _c); + init(); + } + + // compiler-generated copy ctor and assignment operator are fine + result_type a() const { return _a; } + result_type b() const { return _b; } + result_type c() const { return _c; } + + void reset() { } + + template + result_type operator()(Engine& eng) + { +#ifndef BOOST_NO_STDC_NAMESPACE + using std::sqrt; +#endif + result_type u = eng(); + if( u <= q1 ) + return _a + p1*sqrt(u); + else + return _c - d3*sqrt(d2*u-d1); + } + +#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) + template + friend std::basic_ostream& + operator<<(std::basic_ostream& os, const triangle_distribution& td) + { + os << td._a << " " << td._b << " " << td._c; + return os; + } + + template + friend std::basic_istream& + operator>>(std::basic_istream& is, triangle_distribution& td) + { + is >> std::ws >> td._a >> std::ws >> td._b >> std::ws >> td._c; + td.init(); + return is; + } +#endif + +private: + void init() + { +#ifndef BOOST_NO_STDC_NAMESPACE + using std::sqrt; +#endif + d1 = _b - _a; + d2 = _c - _a; + d3 = sqrt(_c - _b); + q1 = d1 / d2; + p1 = sqrt(d1 * d2); + } + + result_type _a, _b, _c; + result_type d1, d2, d3, q1, p1; +}; + +} // namespace boost + +#endif // BOOST_RANDOM_TRIANGLE_DISTRIBUTION_HPP