1.vector底层实现是数组; list是双向链表; 2.vector是顺序内存,支持随机访问,list不行; 3.vector在中间节点进行插入删除会导致内存拷贝,list不会; 4.vector一次性分配好内存,不够时才进行翻倍扩容;list每次插入新节点都会进行内存申请; 5.vector随机访问性能好,插入删除性能差;list随机访问性能差,插入删除性能好. ...
它演示 emplace_back 如何转发参数给 President 的构造函数,并展示如何用 emplace_back 避免用 push_back 时的额外复制或移动操作。 运行此代码 #include <list> #include <cassert> #include <iostream> #include <string> struct President { std::string name; std::string country; int year; President(std...
std::list template<class...Args> voidemplace_back(Args&&...args); (until C++17) template<class...Args> reference emplace_back(Args&&...args); (since C++17) (constexpr since C++26) Appends a new element to the end of the container. The element is constructed throughstd::allocator_trai...
Template:cpp/container/forward list/navbar heading(编辑) Template:cpp/container/forward list/title(编辑) Template:cpp/container/navbar content(编辑) Template:cpp/container/navbar heading(编辑) Template:cpp/container/note iterator invalidation(编辑) ...
{//v.push_back(make_pair(s, i));//v.push_back({s, i});v.push_back(pair<string,int>(s, i));/*vec.emplace_back(str, i); //!! easiest way. 我没想到的方法*/}for(autoch : v) { cout << ch.first <<"--"<< ch.second << endl; }while(1) {/* code */}return0; ...
定位:根据 C++11 的要求,emplace()/emplace_front()/emplace_back()/emplace_hint()/emplace_after()已在所有包含“任意”数量参数的容器中实现(请参见“模拟的可变参数”部分)。 例如,vector<T>具有“template <typename... Args> void emplace_back(Args&&... args)”(它在向量的后面从任意数量的任意参数...
httplib::Params params; params.emplace("name", "john"); params.emplace("note", "coder"); auto res = cli.Post("/post", params); or httplib::Params params{ { "name", "john" }, { "note", "coder" } }; auto res = cli.Post("/post", params); POST with Multipart Form Data...
deque::emplace_front (C++11) deque::prepend_range (C++23) deque::pop_front deque::push_back deque::emplace_back (C++11) deque::append_range (C++23) deque::pop_back deque::resize deque::swap Non-member functions operator==operator!=operator<operator>operator<=operator>=operator<=> ...
-vector list deque 关联式容器 (Associated containers) -元素取决于特定的排序准则,和插入顺序无关 -set multiset map multimap array array <int ,5>={1,2,3,4,5}; -静态数组,栈上 vector 动态数组 堆上 mv.push_back() -不需要变长,容量较小,array 需要变长,容量较大,用vector ...
emplace_back(std::move(result)); } size_t total_count = 0; for(auto& result : chunk_count) { total_count += co_await result; } std::cout << "there are " << total_count << " even numbers in the vector" << std::endl; } int main() { concurrencpp::runtime runtime; ...