std::vector 可以初始化为 std::vector<std::string> words1 {"the", "frogurt", "is", "also", "cursed"}; 参考 现在,如果想为我的一种类型实现类似的功能,我该怎么做呢?我应该如何实现这个功能的构造函数? 标准如何支持我实现这一目标(参考标准将最有帮助)?基本上,如果你能教我如何实现 std:
int idCache[10000]; // array declared, no need to initialize idCache[currentWindowPos] = myWin...
使用std::_Bvector_impl_data 类的成员变量来记录这块内存的使用情况。 先看下整体实现。 template <typename _Alloc> void vector<bool, _Alloc>::_M_initialize(size_type __n) { if (__n) { _Bit_pointer __q = this->_M_allocate(__n); // 分配__n个字节的内存 this->_M_impl._M_end...
174explicitvector(constallocator_type &__a): _Base(__a) {}209vector(initializer_list<value_type> __l,210constallocator_type &__a =allocator_type())211: _Base(__a) {212_M_range_initialize(__l.begin(), __l.end(),random_access_iterator_tag());213}214template<typename_InputIterator...
std::initialize_list<T>作为返回值 正常情况,我们应该返回一个vector<T>,但是呢,因为我这是嵌入式,我不想动态开辟。于是我突发其想,返回个intialize_list,在写这个代码时,我就觉得可能不正确,因为intialize_list类中没有个数。抱着试一试的心态,我还是写了这个代码。结果,果然是不正确的。
问如何默认初始化std::vectorEN为了避免由于不同的行为而引起的任何混淆
static std::vector<std::string> staticData; std::vector<std::string> initializeStaticData(); void foo() { static std::once_flag oc; //执行initializeStaticData函数,当下次再次执行到这个语句时,就不会再去执行了,因为oc被执行过一次了
vector<int> v; // Initialize vector InsertValuesToVector(v); // OK, perfoming traversing the vector, and delete // some elements vector<int>::iterator it = v.begin(); // NOTICE! The trick is to use while loop instead of // for loop while(it != v.end()) { bool shouldDelete ...
std::vector<int> vec2(5); // Creates a vector of size 5 with all elements as 0Code language: C++ (cpp) Initialization with Size and Default Value This initializes the vector with a given size, and all elements will have a specified default value. ...
In C++11, we got a handy way to initialize various containers. Rather than using push_back() or insert() several times, you can leverage a single constructor by taking an initializer list. For example, with a vector of strings, you can write: std::vector