278 lines
7.4 KiB
Markdown
278 lines
7.4 KiB
Markdown
TinySTL
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=======
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采用C++11实现一款简易的STL标准库，既是C++STL的一个子集（裁剪了一些容器和算法）又是一个超集（增加了一些容器和算法）
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目的：练习数据结构与算法和C++ Template编程
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编译环境：VS2013及以上版本
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##开发计划：
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* STL的几大基本组件，如string、vector、list、deque、set、map、unordered_\*等
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* STL算法库中的大部分算法
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* circular buffer
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* bitmap
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* skip list
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* binary search tree
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* AVL tree
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* rbtree
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* 线段树
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* splay tree
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* rope
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* Van Emde Boas tree
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* treap
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* B-tree
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* trie
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* suffix array/tree
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* Disjoint-set data structure
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* k-d tree
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* R-tree
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* Matrix
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* Graph
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* bloom filter
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##完成进度：
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* STL的几大基本组件
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* type traits：100%
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* 空间配置器：100%
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* iterator traits：100%
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* reverse_iterator：100%
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* vector：100%
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* string：100%
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* priority_queue：100%
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* stack：100%
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* deque：100%
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* queue：100%
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* pair：100%
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* STL Algorithms:
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* fill：100%
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* fill_n：100%
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* find：100%
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* is_heap：100%
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* min、max：100%
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* make_heap：100%
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* pop_heap：100%
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* push_heap：100%
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* sort_heap：100%
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* swap：100%
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* all_of：100%
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* any_of：100%
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* none_of：100%
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* find_if：100%
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* find_if_not：100%
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* adjacent_find：100%
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* count：100%
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* count_if：100%
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* mismatch：100%
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* 其他组件：
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* circular_buffer：100%
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* bitmap：100%
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* binary_search_tree：100%
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* avl_tree：100%
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#TinySTL测试:
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###测试环境：Windows 7 && VS2013 && release模式
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###测试结果：
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####(1):vector<int>
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//std::vector<int> vec;
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TinySTL::vector<int> vec;
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ProfilerInstance::start();
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int i = 0;
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for (; i != 10000; ++i){
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vec.push_back(i);
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::vector<int>|10万|2|
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|TinySTL::vector<int>|100万|11|
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|TinySTL::vector<int>|1000万|129|
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|std::vector<int>|10万|6|
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|std::vector<int>|100万|16|
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|std::vector<int>|1000万|210|
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####(2):vector<string>
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//std::vector<std::string> vec;
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TinySTL::vector<std::string> vec;
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ProfilerInstance::start();
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int i = 0;
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for (; i != 100000; ++i){
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vec.push_back(std::string("zouxiaohang"));
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::vector<string>|10万|18|
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|TinySTL::vector<string>|100万|181|
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|TinySTL::vector<string>|1000万|2372|
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|std::vector<string>|10万|29|
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|std::vector<string>|100万|232|
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|std::vector<string>|1000万|1972|
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####(3):circular_buffer<int, N>
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TinySTL::circular_buffer<int, 10000> cb(10000, 0);
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//boost::circular_buffer<int> cb(10000, 0);
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ProfilerInstance::start();
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for (int i = 0; i != 10000000; ++i){
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cb.push_back(i);
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::circular_buffer|1000万|75|
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|TinySTL::circular_buffer|10000万|604|
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|TinySTL::circular_buffer|100000万|5936|
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|boost::circular_buffer|1000万|22|
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|boost::circular_buffer|10000万|252|
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|boost::circular_buffer|100000万|2241|
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####(4):题目：利用bitmap找出str中未出现的字母
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std::string str("abcdefghijklmnpqrstuvwxyz");
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TinySTL::bitmap<26> bm;
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for (auto it = str.cbegin(); it != str.cend(); ++it){
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bm.set(*it - 'a');
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}
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cout << bm << endl;
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cout << bm.size() << endl;
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for (int i = 0; i != 26; ++i){
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if (!bm.test(i))
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cout << "字母" << (char)('a' + i) << "没出现！！！" << endl;
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}
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输出结果：
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111111111111110111111111111000000
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32
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字母o没出现！！！
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####(5):string
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//std::string str;
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TinySTL::string str;
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ProfilerInstance::start();
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int i = 0;
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for (; i != 1000000; ++i){
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str.push_back('x');
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::string|100万|7|
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|TinySTL::string|1000万|39|
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|TinySTL::string|10000万|484|
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|std::string|100万|37|
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|std::string|1000万|229|
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|std::string|10000万|1965|
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####(6):priority_queue<int>
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//std::priority_queue<int> pq;
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TinySTL::priority_queue<int> pq;
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ProfilerInstance::start();
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int i = 0;
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for (; i != 100000; ++i){
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pq.push(i);
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::priority_queue<int>|10万|13|
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|TinySTL::priority_queue<int>|100万|97|
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|TinySTL::priority_queue<int>|1000万|1032|
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|std::priority_queue<int>|10万|12|
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|std::priority_queue<int>|100万|67|
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|std::priority_queue<int>|1000万|752|
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TinySTL::vector<int> v;
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int i = 0;
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for (; i != 100000; ++i){
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v.push_back(i);
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}
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//std::priority_queue<int> pq(v.begin(), v.end());
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TinySTL::priority_queue<int> pq(v.begin(), v.end());
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ProfilerInstance::start();
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for (i = 0; i != 100000; ++i){
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pq.pop();
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::priority_queue<int>|10万|19|
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|TinySTL::priority_queue<int>|100万|137|
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|TinySTL::priority_queue<int>|1000万|1532|
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|std::priority_queue<int>|10万|7|
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|std::priority_queue<int>|100万|92|
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|std::priority_queue<int>|1000万|1214|
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####(7):binary_search_tree<int>
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TinySTL::binary_search_tree<int> bst;
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const size_t max = 10000;
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std::random_device rd;
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ProfilerInstance::start();
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size_t i = 0;
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for (; i != max; ++i){
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bst.insert(rd());
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//rd();
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::binary_search_tree<int>|1万|5|
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|TinySTL::binary_search_tree<int>|10万|64|
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|TinySTL::binary_search_tree<int>|100万|828|
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#######注：真实的插入时间 = 总的插入时间 - C++11随机数生成器生成随机数的总的时间
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####(8):deque<int>
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//std::deque<int> dq;
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TinySTL::deque<int> dq;
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ProfilerInstance::start();
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const int max = 10000000;
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int i = 0;
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for (; i != max / 2; ++i){
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dq.push_front(i);
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}
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for (; i != max; ++i){
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dq.push_back(i);
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}
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ProfilerInstance::finish();
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ProfilerInstance::dumpDuringTime();
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|container|quantity|time(ms)|
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|---------|--------|--------|
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|TinySTL::deque<int>|10万|15|
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|TinySTL::deque<int>|100万|78|
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|TinySTL::deque<int>|1000万|1186|
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|std::deque<int>|10万|90|
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|std::deque<int>|100万|1087|
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|std::deque<int>|1000万|4835|
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#####ps：这个性能差距的原因1是内部实现的机制不同，我的deque是预先分配内存因此相同条件下占用的内存更多，而stl的deque是需要的时候再分配，更加节省内存；2是stl的deque实现了更多更灵活的插入删除操作，我只是实现了在头尾的插入和删除
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####(9):avl_tree<int>
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TinySTL::binary_search_tree<int> bst;
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TinySTL::avl_tree<int> avlt;
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for (int i = 0; i != 10000; ++i){
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avlt.insert(i);
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bst.insert(i);
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}
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cout << "binary_search_tree height = " << bst.height() << endl;
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cout << "avl_tree height = " << avlt.height() << endl;
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输出结果：
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binary_search_tree height = 10000
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avl_tree height = 14
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