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shuffle_output.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\random\shuffle_output.hpp
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/* boost random/shuffle_output.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: shuffle_output.hpp 41369 2007-11-25 18:07:19Z bemandawes $ * * Revision history * 2001-02-18 moved to individual header files */ #ifndef BOOST_RANDOM_SHUFFLE_OUTPUT_HPP #define BOOST_RANDOM_SHUFFLE_OUTPUT_HPP #include
#include
// std::copy #include
#include
#include
#include
#include
#include
namespace boost { namespace random { // Carter Bays and S.D. Durham 1979 template
class shuffle_output { public: typedef UniformRandomNumberGenerator base_type; typedef typename base_type::result_type result_type; BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); BOOST_STATIC_CONSTANT(int, buffer_size = k); shuffle_output() : _rng() { init(); } #if defined(BOOST_MSVC) && _MSC_VER < 1300 // MSVC does not implicitly generate the copy constructor here shuffle_output(const shuffle_output & x) : _rng(x._rng), y(x.y) { std::copy(x.v, x.v+k, v); } #endif template
explicit shuffle_output(T s) : _rng(s) { init(); } explicit shuffle_output(const base_type & rng) : _rng(rng) { init(); } template
shuffle_output(It& first, It last) : _rng(first, last) { init(); } void seed() { _rng.seed(); init(); } template
void seed(T s) { _rng.seed(s); init(); } template
void seed(It& first, It last) { _rng.seed(first, last); init(); } const base_type& base() const { return _rng; } result_type operator()() { // calculating the range every time may seem wasteful. However, this // makes the information locally available for the optimizer. result_type range = (max)()-(min)()+1; int j = k*(y-(min)())/range; // assert(0 <= j && j < k); y = v[j]; v[j] = _rng(); return y; } result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (_rng.min)(); } result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (_rng.max)(); } static bool validation(result_type x) { return val == x; } #ifndef BOOST_NO_OPERATORS_IN_NAMESPACE #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS template
friend std::basic_ostream
& operator<<(std::basic_ostream
& os, const shuffle_output& s) { os << s._rng << " " << s.y << " "; for(int i = 0; i < s.buffer_size; ++i) os << s.v[i] << " "; return os; } template
friend std::basic_istream
& operator>>(std::basic_istream
& is, shuffle_output& s) { is >> s._rng >> std::ws >> s.y >> std::ws; for(int i = 0; i < s.buffer_size; ++i) is >> s.v[i] >> std::ws; return is; } #endif friend bool operator==(const shuffle_output& x, const shuffle_output& y) { return x._rng == y._rng && x.y == y.y && std::equal(x.v, x.v+k, y.v); } friend bool operator!=(const shuffle_output& x, const shuffle_output& y) { return !(x == y); } #else // Use a member function; Streamable concept not supported. bool operator==(const shuffle_output& rhs) const { return _rng == rhs._rng && y == rhs.y && std::equal(v, v+k, rhs.v); } bool operator!=(const shuffle_output& rhs) const { return !(*this == rhs); } #endif private: void init() { #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS BOOST_STATIC_ASSERT(std::numeric_limits
::is_integer); #endif result_type range = (max)()-(min)(); assert(range > 0); // otherwise there would be little choice if(static_cast
(k * range) < static_cast
(range)) // not a sufficient condition // likely overflow with bucket number computation assert(!"overflow will occur"); // we cannot use std::generate, because it uses pass-by-value for _rng for(result_type * p = v; p != v+k; ++p) *p = _rng(); y = _rng(); } base_type _rng; result_type v[k]; result_type y; }; #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION // A definition is required even for integral static constants template
const bool shuffle_output
::has_fixed_range; template
const int shuffle_output
::buffer_size; #endif } // namespace random // validation by experiment from Harry Erwin's generator.h (private e-mail) typedef random::shuffle_output< random::linear_congruential
, 97, 139726> kreutzer1986; } // namespace boost #endif // BOOST_RANDOM_SHUFFLE_OUTPUT_HPP
shuffle_output.hpp
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