1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283 |
- /////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2007-2013
- //
- // 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/libs/intrusive for documentation.
- //
- /////////////////////////////////////////////////////////////////////////////
- //[doc_bucket_traits
- #include <boost/intrusive/unordered_set.hpp>
- #include <boost/functional/hash.hpp>
- #include <vector>
- using namespace boost::intrusive;
- //A class to be inserted in an unordered_set
- class MyClass : public unordered_set_base_hook<>
- {
- int int_;
- public:
- MyClass(int i = 0) : int_(i)
- {}
- friend bool operator==(const MyClass &l, const MyClass &r)
- { return l.int_ == r.int_; }
- friend std::size_t hash_value(const MyClass &v)
- { return boost::hash_value(v.int_); }
- };
- //Define the base hook option
- typedef base_hook< unordered_set_base_hook<> > BaseHookOption;
- //Obtain the types of the bucket and the bucket pointer
- typedef unordered_bucket<BaseHookOption>::type BucketType;
- typedef unordered_bucket_ptr<BaseHookOption>::type BucketPtr;
- //The custom bucket traits.
- class custom_bucket_traits
- {
- public:
- static const int NumBuckets = 100;
- custom_bucket_traits(BucketPtr buckets)
- : buckets_(buckets)
- {}
- //Functions to be implemented by custom bucket traits
- BucketPtr bucket_begin() const { return buckets_; }
- std::size_t bucket_count() const { return NumBuckets;}
- private:
- BucketPtr buckets_;
- };
- //Define the container using the custom bucket traits
- typedef unordered_set<MyClass, bucket_traits<custom_bucket_traits> > BucketTraitsUset;
- int main()
- {
- typedef std::vector<MyClass>::iterator VectIt;
- std::vector<MyClass> values;
- //Fill values
- for(int i = 0; i < 100; ++i) values.push_back(MyClass(i));
- //Now create the bucket array and the custom bucket traits object
- BucketType buckets[custom_bucket_traits::NumBuckets];
- custom_bucket_traits btraits(buckets);
- //Now create the unordered set
- BucketTraitsUset uset(btraits);
- //Insert the values in the unordered set
- for(VectIt it(values.begin()), itend(values.end()); it != itend; ++it)
- uset.insert(*it);
- return 0;
- }
- //]
|