std::vector<bool>表现类似std::vector,但为节省空间,它: 不必作为连续数组存储元素 暴露类std::vector<bool>::reference为访问单个位的方法。尤其是,operator[]以值返回此类型的对象。 不使用std::allocator_traits::construct构造位值。 不保证同一容器中的不同元素能由不同线程同时修改。
The std::vector<bool, Alloc> specializations define std::vector<bool, Alloc>::reference as a publicly-accessible nested class. std::vector<bool, Alloc>::reference proxies the behavior of references to a single bit in std::vector<bool, Alloc>. The primary use of std::vector<bool, Alloc...
类模板 std::vector 对bool 的特化namespace std { template<class Allocator> class vector<bool, Allocator> { public: // 类型 using value_type = bool; using allocator_type = Allocator; using pointer = /* 由实现定义 */; using const_pointer = /* 由实现定义 */; using const_reference = ...
vector<bool> space-efficient dynamic bitset (class template specialization) Iterator invalidation OperationsInvalidated All read only operationsNever. swap,std::swapend() clear,operator=,assignAlways. reserve,shrink_to_fitIf the vector changed capacity, all of them. If not, none. ...
std::vector<T>是我们经常用到的STL容器,但是std::vector<bool>比较特殊,其特殊之处在于operato[]返回的元素类型是std::vector<bool>::reference(一个嵌套于std::vector<bool>中的类)。 std::vector<bool>::reference之所以存在是因为std::vector<bool>规定了使用一个打包形式(packed form)表示它的bool,每个...
From cppreference.com <cpp |container |vector bool C++ Defined in header<vector> voidflip(); (until C++20) constexprvoidflip(); (since C++20) Toggles eachboolin thevector(replaces with its opposite value). Parameters (none)
reference&operator=(constreference& Right); reference&operator=(boolVal); 参数 Right 要将值赋给位的元素引用。 Val 要赋给位的布尔值。 示例 C++复制 // vector_bool_ref_op_assign.cpp// compile with: /EHsc#include<vector>#include<iostream>#include<string>usingnamespacestd;template<typenameC>void...
vectorbool.cpp: In function ‘void func(std::vector<T>&) [with T = bool']’: vectorbool.cpp:18:11: instantiated from here vectorbool.cpp:9:17: error: invalid initialization of non-const reference of type ’bool&’ from an rvalue of type ‘std::vector<bool>::reference {aka std::...
vector<bool>::reference::flip 反转引用的vector<bool>元素的布尔值。 C++ voidflip(); 示例 C++ // vector_bool_ref_flip.cpp// compile with: /EHsc /W4#include<vector>#include<iostream>intmain(){usingnamespacestd;cout<< boolalpha;vector<bool> vb = {true,false,false,true,true};cout<<"The...
vector<bool> space-efficient dynamic bitset (class template specialization) Iterator invalidation OperationsInvalidated All read only operationsNever. swap,std::swapend() clear,operator=,assignAlways. reserve,shrink_to_fitIf the vector changed capacity, all of them. If not, none. ...