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95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
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// Copyright Daniel James 2005-2006. Use, modification, and distribution are
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// A crude wrapper round Boost.Random to make life easier.
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#if !defined(BOOST_UNORDERED_TEST_HELPERS_GENERATORS_HEADER)
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#define BOOST_UNORDERED_TEST_HELPERS_GENERATORS_HEADER
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#include <string>
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#include <utility>
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#include <boost/random/inversive_congruential.hpp>
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#include <boost/random/uniform_int.hpp>
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#include <boost/random/lagged_fibonacci.hpp>
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#include <boost/random/uniform_real.hpp>
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#include <boost/random/variate_generator.hpp>
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#include "./fwd.hpp"
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namespace test
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{
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typedef boost::hellekalek1995 integer_generator_type;
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typedef boost::lagged_fibonacci607 real_generator_type;
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template <class T>
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struct generator
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{
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typedef T value_type;
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value_type operator()()
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{
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return generate((T const*) 0);
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}
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};
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inline int generate(int const*)
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{
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integer_generator_type gen;
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boost::uniform_int<> dist(0, 1000);
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static boost::variate_generator<integer_generator_type, boost::uniform_int<> >
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vg(gen, dist);
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return vg();
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}
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inline char generate(char const*)
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{
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integer_generator_type gen;
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boost::uniform_int<char> dist(32, 128);
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static boost::variate_generator<integer_generator_type, boost::uniform_int<char> >
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vg(gen, dist);
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return vg();
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}
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inline std::string generate(std::string const*)
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{
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using namespace std;
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static test::generator<char> char_gen;
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std::string result;
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int length = rand() % 10;
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for(int i = 0; i < length; ++i)
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result += char_gen();
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//std::generate_n(
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// std::back_inserter(result),
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// rand() % 10,
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// char_gen);
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return result;
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}
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float generate(float const*)
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{
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real_generator_type gen;
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boost::uniform_real<float> dist;
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static boost::variate_generator<real_generator_type, boost::uniform_real<float> >
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vg(gen, dist);
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return vg();
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}
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template <class T1, class T2> std::pair<T1, T2> generate(
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std::pair<T1, T2> const*)
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{
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static generator<T1> g1;
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static generator<T2> g2;
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return std::pair<T1, T2>(g1(), g2());
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}
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}
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#endif
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