std::pointer_traits 定义于头文件<memory> template<classPtr>structpointer_traits; (1)(C++11 起) template<classT>structpointer_traits<T*>; (2)(C++11 起) pointer_traits类模板提供标准化方法,访问类指针类型(缀饰指针,如boost::interprocess::offset_ptr)的某些属性。标准模板std::allocator_traits依靠po...
std::pointer_to_binary_function std::pointer_to_unary_function std::pointer_traits std::ptrdiff_t std::ptr_fun std::quick_exit std::raise std::range_error std::rank std::rbegin(std::initializer_list) std::realloc std::ref std::reference_wrapper std::reference_wrapper::get std::referen...
std::is_pointer是false为std::nullptr_t因为它不是内置的指针类型。 例 二次 代码语言:javascript 复制 #include <iostream> #include <type_traits> int main() { std::cout << std::boolalpha << std::is_null_pointer< decltype(nullptr) >::value << ' ' << std::is_null_pointer< int* >:...
//使用iterator提供的信息template<typenameIterator>structiterator_traits{typedeftypenameIterator::iterator_category iterator_category;typedeftypenameIterator::value_type value_typep;typedeftypenameIterator::difference_type difference_type;typedeftypenameIterator::pointer pointer;typedeftypenameIterator::reference referenc...
std::iterator 与 std::iterator_traits std::iterator std::iterator是一个模板类,其声明为: template<classCategory,classT,classDistance= std::ptrdiff_t,classPointer = T*,classReference = T& >structiterator; std::iterator是为简化迭代器所需类型的定义而提供的基类。也就是说当我们写一个模板类时,...
std::pointer_to_binary_function std::pointer_to_unary_function std::pointer_traits std::ptrdiff_t std::ptr_fun std::quick_exit std::raise std::range_error std::rank std::rbegin(std::initializer_list) std::realloc std::ref std::reference_wrapper std::reference_wrapper::get std::referen...
std::pointer_safety std::pointer_to_binary_function std::pointer_to_unary_function std::pointer_traits std::ptrdiff_t std::ptr_fun std::quick_exit std::raise std::range_error std::rank std::rbegin(std::initializer_list) std::realloc std::ref std::reference_wrapper std::reference_wrappe...
value_typestd::readable_traits<Iter>::value_type pointer若合法则为Iter::pointer,否则若合法则为decltype(std::declval<Iter&>().operator->()),否则为void reference若合法则为Iter::reference,否则为std::iter_reference_t<Iter> iterator_category若合法则为Iter::iterator_category, ...
pointer const T* reference const T& char_type CharT traits_type Traits istream_type std::basic_istream<CharT, Traits> 要求通过从 std::iterator<std::input_iterator_tag, T, Distance, const T*, const T&> 继承获得成员类型 iterator_category、 value_type、 difference_type、 pointer 及ref...
std::iterator 与 std::iterator_traits std::iterator是一个模板类,其声明为: template< class Category, class T, class Distance = std::ptrdiff_t, class Pointer = T*, class Reference = T& > struct iterator; 1. 2. 3. 4. 5. 6.