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 0aa7e0d..0f4a0ab 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 |