std::map<Key,T,Compare,Allocator>::contains std::map<Key,T,Compare,Allocator>::equal_range std::map<Key,T,Compare,Allocator>::lower_bound std::map<Key,T,Compare,Allocator>::upper_bound std::map<Key,T,Compare,Allocator>::key_comp std::map<Key,T,Compare,Allocator>::value_comp std::...
value_typestd::pair<constKey, T> size_type无符号整数类型(通常是std::size_t) difference_type有符号整数类型(通常是std::ptrdiff_t) key_compareCompare allocator_typeAllocator referencevalue_type& const_referenceconstvalue_type& pointer Allocator::pointer ...
std::cout << "mymap contains:\n"; for (it=mymap.begin(); it!=mymap.end(); ++it) std::cout << it->first << " => " << it->second << '\n'; std::cout << "anothermap contains:\n"; for (it=anothermap.begin(); it!=anothermap.end(); ++it) std::cout << it->fi...
const KeyType & key) { if(!map.contains(key)) { return std::numeric_limits<ValueType>::infinity(); } else { return map[key]; } } int main() { std::map<std::string, int> map; auto el = mapDefault
map::count map::find map::contains (C++20) map::equal_range map::lower_bound map::upper_bound Observers map::key_comp map::value_comp Non-member functions operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until...
boolcontains(constK&x)const; (2)(since C++20) 1)Checks if there is an element with key equivalent tokeyin the container. 2)Checks if there is an element with key that comparesequivalentto the valuex. This overload participates in overload resolution only if the qualified-idCompare::is_...
如C++的名著《The C++ Standard Library》中所述: “A map is a sorted associative container that contains key-value pairs with unique keys. Keys are sorted by using the comparison function Compare…The complexity for searching operations is logarithmic in the size of the containers.”(map是一个排...
您可以使用索引创建一个双向映射-您可以使用这对的任何一个值作为键来快速查找。
开发中会遇到对Map元素排序的问题,下面介绍下如何根据key、value排序. key排序 使用TreeMap的Comparator...
value_typestd::pair<constKey, T> size_type无符号整数类型(通常是std::size_t) difference_type有符号整数类型(通常是std::ptrdiff_t) hasherHash key_equalKeyEqual allocator_typeAllocator referencevalue_type& const_referenceconstvalue_type& pointerstd::allocator_traits<Allocator>::pointer ...