一个典型的例子就是 std::vector ,其构造器会直接取传入对象的内存地址来接管这个对象本身,而不会再重新分配一块新的内存,再把每个元素都挨个复制一遍。 移动构造器也允许传递所有权,类似于 std::unique_ptr。 也可以通过重载赋值运算符,将一次性对象赋值给一个对象: class MyClass { public: // ... My...
std::vector<int, MyAllocator<int>> a; a.push_back(10); std::cout <<"a.data() addr mod 32 is "<<reinterpret_cast<uint64_t>(a.data()) %32<< std::endl; std::cout << std::hex <<reinterpret_cast<uint64_t>(a.data()) << std::endl;return0; } 结果,可以看到分配的内存的...
(constructor) constructs the vector (public member function of std::vector<T,Allocator>) (destructor) destructs the vector (public member function of std::vector<T,Allocator>) operator= assigns values to the container (public member function of std::vector<T,Allocator>) assign as...
const_reverse_iteratorstd::reverse_iterator<const_iterator> Member functions (constructor) constructs thevector (public member function) (destructor) destructs thevector (public member function) operator= assigns values to the container (public member function) ...
常见的 容器比如 向量 vector 或vector 就是模板类 template<class E,class T> class Queue { public: T add(E e,T t){ return e+t; } }; Queue<int,float> q; q.add(1,1.1f) = 2.1f 分类: C/C++ 好文要顶 关注我 收藏该文 微信分享 咸鱼Jay 粉丝- 21 关注- 5 +加关注 0 «...
__cpp_lib_constexpr_vector constexpr 的 std::vector 201907L (C++20) P1004R2 __cpp_lib_constrained_equality std::pair、std::tuple、std::optional 和std::variant 的受约束关系运算符 202403L (C++26) P2944R3 约束std::expected 的相等性运算符 202411L P3379R0 __cpp_lib_containers_rang...
(constructor) constructs the reference. Accessible only to std::vector<bool, Alloc> itself (public member function) (destructor) destroys the reference (public member function) operator= assigns a bool to the referenced bit (public member function) operator bool returns the referenced...
在SetA方法中 ,又一次调用std::move, 这里的知识点是右值引用其实是左值 Rref is Lval,只有再一次move,才能调用到Apple的move assgin 构造函数-Engine实际案例 template <typename T> class Future final { public: /** * @brief Move constructor */ ...
std::vector<curl_easy> handlers; // Create a vector of curl streams. std::vector<curl_ios<std::ostringstream>> streams; // Create the curl easy handler and associated the streams with it. for (const auto & url : urls) { auto *output_stream = new std::ostringstream; curl_ios<std:...
a1; a1.push_back(Foo1()); a1.push_back(Foo1()); // 触发容器扩张,搬移已有元素时调用copy constructor class Foo2 { public: Foo2(Foo2&& other) noexcept; }; std::vector<Foo2> a2; a2.push_back(Foo2()); a2.push_back(Foo2()); // 触发容器扩张,搬移已有元素时调用move construc...