diff options
Diffstat (limited to 'contrib/src/boost/uuid/random_generator.hpp')
-rw-r--r-- | contrib/src/boost/uuid/random_generator.hpp | 238 |
1 files changed, 119 insertions, 119 deletions
diff --git a/contrib/src/boost/uuid/random_generator.hpp b/contrib/src/boost/uuid/random_generator.hpp index 7ca025b..0aa7e0d 100644 --- a/contrib/src/boost/uuid/random_generator.hpp +++ b/contrib/src/boost/uuid/random_generator.hpp @@ -1,119 +1,119 @@ -// Boost random_generator.hpp header file ----------------------------------------------// - -// Copyright 2010 Andy Tompkins. -// 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) - -#ifndef BOOST_UUID_RANDOM_GENERATOR_HPP -#define BOOST_UUID_RANDOM_GENERATOR_HPP - -#include <boost/uuid/uuid.hpp> -#include <boost/uuid/seed_rng.hpp> -#include <boost/random/uniform_int.hpp> -#include <boost/random/variate_generator.hpp> -#include <boost/random/mersenne_twister.hpp> -#include <boost/assert.hpp> -#include <boost/shared_ptr.hpp> -#include <limits> - -namespace boost { -namespace uuids { - -// generate a random-based uuid -template <typename UniformRandomNumberGenerator> -class basic_random_generator { -private: - typedef uniform_int<unsigned long> distribution_type; - typedef variate_generator<UniformRandomNumberGenerator*, distribution_type> generator_type; - - struct null_deleter - { - void operator()(void const *) const {} - }; - -public: - typedef uuid result_type; - - // default constructor creates the random number generator - basic_random_generator() - : pURNG(new UniformRandomNumberGenerator) - , generator - ( pURNG.get() - , distribution_type - ( (std::numeric_limits<unsigned long>::min)() - , (std::numeric_limits<unsigned long>::max)() - ) - ) - { - // seed the random number generator - detail::seed(*pURNG); - } - - // keep a reference to a random number generator - // don't seed a given random number generator - explicit basic_random_generator(UniformRandomNumberGenerator& gen) - : pURNG(&gen, null_deleter()) - , generator - ( pURNG.get() - , distribution_type - ( (std::numeric_limits<unsigned long>::min)() - , (std::numeric_limits<unsigned long>::max)() - ) - ) - {} - - // keep a pointer to a random number generator - // don't seed a given random number generator - explicit basic_random_generator(UniformRandomNumberGenerator* pGen) - : pURNG(pGen, null_deleter()) - , generator - ( pURNG.get() - , distribution_type - ( (std::numeric_limits<unsigned long>::min)() - , (std::numeric_limits<unsigned long>::max)() - ) - ) - { - BOOST_ASSERT(pURNG); - } - - uuid operator()() - { - uuid u; - - int i=0; - unsigned long random_value = generator(); - for (uuid::iterator it=u.begin(); it!=u.end(); ++it, ++i) { - if (i==sizeof(unsigned long)) { - random_value = generator(); - i = 0; - } - - // static_cast gets rid of warnings of converting unsigned long to boost::uint8_t - *it = static_cast<uuid::value_type>((random_value >> (i*8)) & 0xFF); - } - - // set variant - // must be 0b10xxxxxx - *(u.begin()+8) &= 0xBF; - *(u.begin()+8) |= 0x80; - - // set version - // must be 0b0100xxxx - *(u.begin()+6) &= 0x4F; //0b01001111 - *(u.begin()+6) |= 0x40; //0b01000000 - - return u; - } - -private: - shared_ptr<UniformRandomNumberGenerator> pURNG; - generator_type generator; -}; - -typedef basic_random_generator<mt19937> random_generator; - -}} // namespace boost::uuids - -#endif //BOOST_UUID_RANDOM_GENERATOR_HPP +// Boost random_generator.hpp header file ----------------------------------------------//
+
+// Copyright 2010 Andy Tompkins.
+// 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)
+
+#ifndef BOOST_UUID_RANDOM_GENERATOR_HPP
+#define BOOST_UUID_RANDOM_GENERATOR_HPP
+
+#include <boost/uuid/uuid.hpp>
+#include <boost/uuid/seed_rng.hpp>
+#include <boost/random/uniform_int.hpp>
+#include <boost/random/variate_generator.hpp>
+#include <boost/random/mersenne_twister.hpp>
+#include <boost/assert.hpp>
+#include <boost/shared_ptr.hpp>
+#include <limits>
+
+namespace boost {
+namespace uuids {
+
+// generate a random-based uuid
+template <typename UniformRandomNumberGenerator>
+class basic_random_generator {
+private:
+ typedef uniform_int<unsigned long> distribution_type;
+ typedef variate_generator<UniformRandomNumberGenerator*, distribution_type> generator_type;
+
+ struct null_deleter
+ {
+ void operator()(void const *) const {}
+ };
+
+public:
+ typedef uuid result_type;
+
+ // default constructor creates the random number generator
+ basic_random_generator()
+ : pURNG(new UniformRandomNumberGenerator)
+ , generator
+ ( pURNG.get()
+ , distribution_type
+ ( (std::numeric_limits<unsigned long>::min)()
+ , (std::numeric_limits<unsigned long>::max)()
+ )
+ )
+ {
+ // seed the random number generator
+ detail::seed(*pURNG);
+ }
+
+ // keep a reference to a random number generator
+ // don't seed a given random number generator
+ explicit basic_random_generator(UniformRandomNumberGenerator& gen)
+ : pURNG(&gen, null_deleter())
+ , generator
+ ( pURNG.get()
+ , distribution_type
+ ( (std::numeric_limits<unsigned long>::min)()
+ , (std::numeric_limits<unsigned long>::max)()
+ )
+ )
+ {}
+
+ // keep a pointer to a random number generator
+ // don't seed a given random number generator
+ explicit basic_random_generator(UniformRandomNumberGenerator* pGen)
+ : pURNG(pGen, null_deleter())
+ , generator
+ ( pURNG.get()
+ , distribution_type
+ ( (std::numeric_limits<unsigned long>::min)()
+ , (std::numeric_limits<unsigned long>::max)()
+ )
+ )
+ {
+ BOOST_ASSERT(pURNG);
+ }
+
+ uuid operator()()
+ {
+ uuid u;
+
+ int i=0;
+ unsigned long random_value = generator();
+ for (uuid::iterator it=u.begin(); it!=u.end(); ++it, ++i) {
+ if (i==sizeof(unsigned long)) {
+ random_value = generator();
+ i = 0;
+ }
+
+ // static_cast gets rid of warnings of converting unsigned long to boost::uint8_t
+ *it = static_cast<uuid::value_type>((random_value >> (i*8)) & 0xFF);
+ }
+
+ // set variant
+ // must be 0b10xxxxxx
+ *(u.begin()+8) &= 0xBF;
+ *(u.begin()+8) |= 0x80;
+
+ // set version
+ // must be 0b0100xxxx
+ *(u.begin()+6) &= 0x4F; //0b01001111
+ *(u.begin()+6) |= 0x40; //0b01000000
+
+ return u;
+ }
+
+private:
+ shared_ptr<UniformRandomNumberGenerator> pURNG;
+ generator_type generator;
+};
+
+typedef basic_random_generator<mt19937> random_generator;
+
+}} // namespace boost::uuids
+
+#endif //BOOST_UUID_RANDOM_GENERATOR_HPP
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