谁知道C++中的<map>都包含哪些常用函数以及怎么用么?
谁知道 <map> 是干嘛的吗,还有就是它都包含哪些常用的函数以及怎么用,书上突然就出来这个东西,也不交代一下,请各位给我指点,谢谢拉.
[解决办法]
begin Returns an iterator addressing the first element in the map.
clear Erases all the elements of a map.
count Returns the number of elements in a map whose key matches a parameter-specified key.
empty Tests if a map is empty.
end Returns an iterator that addresses the location succeeding the last element in a map.
equal_range Returns an iterator that addresses the location succeeding the last element in a map.
erase Removes an element or a range of elements in a map from specified positions
find Returns an iterator addressing the location of an element in a map that has a key equivalent to a specified key.
get_allocator Returns a copy of the allocator object used to construct the map.
insert Inserts an element or a range of elements into the map at a specified position.
key_comp Retrieves a copy of the comparison object used to order keys in a map.
lower_bound Returns an iterator to the first element in a map that with a key value that is equal to or greater than that of a specified key.
map Constructs a list of a specific size or with elements of a specific value or with a specific allocator or as a copy of some other map.
max_size Returns the maximum length of the map.
rbegin Returns an iterator addressing the first element in a reversed map.
rend Returns an iterator that addresses the location succeeding the last element in a reversed map.
size Returns the number of elements in the map.
swap Exchanges the elements of two maps.
upper_bound Returns an iterator to the first element in a map that with a key value that is greater than that of a specified key.
value_comp Retrieves a copy of the comparison object used to order element values in a map.
Operators
operator[]
[解决办法]
Constructors
map
Constructs a list of a specific size or with elements of a specific value or with a specific allocator or as a copy of some other map.
Typedefs
allocator_type
A type that represents the allocator class for the map object.
const_iterator
A type that provides a bidirectional iterator that can read a const element in the map.
const_pointer
A type that provides a pointer to a const element in a map.
const_reference
A type that provides a reference to a const element stored in a map for reading and performing const operations.
const_reverse_iterator
A type that provides a bidirectional iterator that can read any const element in the map.
difference_type
A signed integer type that can be used to represent the number of elements of a map in a range between elements pointed to by iterators.
iterator
A type that provides a bidirectional iterator that can read or modify any element in a map.
key_compare
A type that provides a function object that can compare two sort keys to determine the relative order of two elements in the map.
key_type
A type that describes the sort key object which constitutes each element of the map.
mapped_type
A type that represents the data type stored in a map.
pointer
A type that provides a pointer to a const element in a map.
reference
A type that provides a reference to an element stored in a map.
reverse_iterator
A type that provides a bidirectional iterator that can read or modify an element in a reversed map.
size_type
An unsigned integer type that can represent the number of elements in a map
value_type
A type that provides a function object that can compare two elements as sort keys to determine their relative order in the map.
Member Functions
begin
Returns an iterator addressing the first element in the map.
clear
Erases all the elements of a map.
count
Returns the number of elements in a map whose key matches a parameter-specified key.
empty
Tests if a map is empty.
end
Returns an iterator that addresses the location succeeding the last element in a map.
equal_range
Returns an iterator that addresses the location succeeding the last element in a map.
erase
Removes an element or a range of elements in a map from specified positions
find
Returns an iterator addressing the location of an element in a map that has a key equivalent to a specified key.
get_allocator
Returns a copy of the allocator object used to construct the map.
insert
Inserts an element or a range of elements into the map at a specified position.
key_comp
Retrieves a copy of the comparison object used to order keys in a map.
lower_bound
Returns an iterator to the first element in a map that with a key value that is equal to or greater than that of a specified key.
max_size
Returns the maximum length of the map.
rbegin
Returns an iterator addressing the first element in a reversed map.
rend
Returns an iterator that addresses the location succeeding the last element in a reversed map.
size
Returns the number of elements in the map.
swap
Exchanges the elements of two maps.
upper_bound
Returns an iterator to the first element in a map that with a key value that is greater than that of a specified key.
value_comp
Retrieves a copy of the comparison object used to order element values in a map.
[解决办法]
Standard C++ Library Reference
map MembersSee Also
map Class | Thread Safety in the Standard C++ Library
Typedefs
allocator_type A type that represents the allocator class for the map object.
const_iterator A type that provides a bidirectional iterator that can read a const element in the map.
const_pointer A type that provides a pointer to a const element in a map.
const_reference A type that provides a reference to a const element stored in a map for reading and performing const operations.
const_reverse_iterator A type that provides a bidirectional iterator that can read any const element in the map.
difference_type A signed integer type that can be used to represent the number of elements of a map in a range between elements pointed to by iterators.
iterator A type that provides a bidirectional iterator that can read or modify any element in a map.
key_compare A type that provides a function object that can compare two sort keys to determine the relative order of two elements in the map.
key_type A type that describes the sort key object which constitutes each element of the map.
mapped_type A type that represents the data type stored in a map.
pointer A type that provides a pointer to a const element in a map.
reference A type that provides a reference to an element stored in a map.
reverse_iterator A type that provides a bidirectional iterator that can read or modify an element in a reversed map.
size_type An unsigned integer type that can represent the number of elements in a map
value_type A type that provides a function object that can compare two elements as sort keys to determine their relative order in the map.
Member Functions
begin Returns an iterator addressing the first element in the map.
clear Erases all the elements of a map.
count Returns the number of elements in a map whose key matches a parameter-specified key.
empty Tests if a map is empty.
end Returns an iterator that addresses the location succeeding the last element in a map.
equal_range Returns an iterator that addresses the location succeeding the last element in a map.
erase Removes an element or a range of elements in a map from specified positions
find Returns an iterator addressing the location of an element in a map that has a key equivalent to a specified key.
get_allocator Returns a copy of the allocator object used to construct the map.
insert Inserts an element or a range of elements into the map at a specified position.
key_comp Retrieves a copy of the comparison object used to order keys in a map.
lower_bound Returns an iterator to the first element in a map that with a key value that is equal to or greater than that of a specified key.
map Constructs a list of a specific size or with elements of a specific value or with a specific allocator or as a copy of some other map.
max_size Returns the maximum length of the map.
rbegin Returns an iterator addressing the first element in a reversed map.
rend Returns an iterator that addresses the location succeeding the last element in a reversed map.
size Returns the number of elements in the map.
swap Exchanges the elements of two maps.
upper_bound Returns an iterator to the first element in a map that with a key value that is greater than that of a specified key.
value_comp Retrieves a copy of the comparison object used to order element values in a map.
Operators
operator[] Inserts an element into a map with a specified key value.
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