cppreference.com 创建账户 页面 讨论 变换 查看 编辑 历史 std::vector C++ 容器库 std::vector 在标头<vector>定义 template< classT, classAllocator=std::allocator<T> >classvector; (1) namespace { template<classT> usingvector=std::vector<T,std::pmr::polymorphic_allocator<T>>; ...
1.inplace_vector— A reference implementation ofP0843R14(std::inplace_vector). 2.static_vector— Boost.Container implements inplace vector as a standalone type with its own guarantees. 3.fixed_vector— EASTL implements inplace vector via an extra template parameter. ...
#include <cassert> #include <inplace_vector> #include <new> #include <utility> int main() { using P = std::pair<int, int>; using I = std::inplace_vector<P, 3>; auto nums = I{{0, 1}, {2, 3}}; auto it = nums.emplace(nums.begin() + 1, -1, -2); assert((*it =...
std::vector<bool> behaves similarly to std::vector, but in order to be space efficient, it: Does not necessarily store its elements as a contiguous array. Exposes class std::vector<bool>::reference as a method of accessing individual bits. In particular, objects of this class are return...
std::cout<< president.name <<"was re-elected president of"<< president.country <<"in"<< president.year <<".\n"; }return0; }///reference:https://stackoverflow.com/questions/4303513/push-back-vs-emplace-backinttest_emplace_3() {/*template <class... Args> pair<iterator,bool> emplace...
is_trivially_copyable:调用[std::memmove]迁移数据(https://en.cppreference.com/w/cpp/string/byte/memmove),std::vector没有这个逻辑。 否则,循环迁移元素。 std::vector迁移元素时,会根据是否有noexcept move constructor来决定调用move constructor还是copy constructor(之前这篇文章提到过:c++ 从vector扩容看noexce...
// cliext_vector_clear.cpp // compile with: /clr #include <cliext/vector> int main() { cliext::vector<wchar_t> c1; c1.push_back(L'a'); c1.push_back(L'b'); c1.push_back(L'c'); // display initial contents " a b c" for each (wchar_t elem in c1) System::Console::Wr...
// cliext_vector_clear.cpp // compile with: /clr #include <cliext/vector> int main() { cliext::vector<wchar_t> c1; c1.push_back(L'a'); c1.push_back(L'b'); c1.push_back(L'c'); // display initial contents " a b c" for each (wchar_t elem in c1) System::Console::Wr...
typedef bool const_reference; 備註 如需詳細資訊和程式碼範例,請參閱 vector<bool>::reference::operator=。 vector<bool>::flip 會反轉 vector<bool> 中的所有位元。 C++ 複製 void flip(); 範例 C++ 複製 // vector_bool_flip.cpp // compile with: /EHsc /W4 #include <vector> #include <io...
Donotuse this class as astd::vectorreplacement in your code! 但是还是就兴冲冲地开始在自己的代码里面使用ImVector代替std::vector(好孩子不要在家里模仿),并且直接把对象存进去(而不是指针)。 然后我发现我其实需要引用语义的容器,因为我偶尔需要取出容器里面的值,在外部改变并塞回去;同一个对象放在多个容器里...