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The std::map is a fundamental part of the C++ Standard Template Library (STL), providing a sorted associative container that maintains key-value pairs with unique keys. The keys in a map are sorted using a comparison function, which allows efficient searching, insertion, and deletion operations—typically with logarithmic complexity.
Key Characteristics and Operations
Sorted: The elements in a std::map are always sorted by key, which allows for efficient range queries.
Unique Keys: Each element's key is unique within the map, ensuring that no two elements have the same key.
Bidirectional Iterators: std::map provides iterators that allow traversal of the container in both directions.
Allocator-aware: The container uses an allocator for dynamic memory management, which can be customized.
Basic Member Functions
Construction and Destruction: A std::map can be constructed with a custom comparison function and allocator. It is destroyed when it goes out of scope or is explicitly deleted.
Assignment: The operator= allows copying or moving a map's contents.
Access: The at and operator[] functions provide access to elements by key, with operator[] also allowing insertion of new elements.
Iterators: Functions like begin, end, rbegin, and rend return iterators to the start and end of the map, as well as in reverse order.
Capacity: Functions such as empty, size, and max_size provide information about the map's storage.
Modifiers: Functions like insert, erase, clear, and swap modify the map's contents.
Observers: The key_comp and value_comp functions return the comparison objects used for keys and values.
Operations: Functions like find, count, lower_bound, upper_bound, and equal_range perform various operations to search and manipulate the map.
Allocator: The get_allocator function returns the map's allocator.
std::map - cppreference.com
WEBAug 2, 2024 — std::map is a sorted associative container that contains key-value pairs with unique keys. Keys are sorted by using the comparison function Compare. Search, removal, and insertion operations have logarithmic complexity. Maps are usually implemented as …
Find
std::map ::find
Begin Cbegin
begin, std::map ::cbegin
Count
std::map ::count
Rbegin Crbegin
Returns a reverse iterator to the first element of the reversed map.It …
Operator
std::map ::operator[]
Swap
Exchanges the contents of the container with those of other.Does not invoke any …
Empty
Initially, numbers.empty(): true After adding elements, numbers.empty(): false [] See als
Map
Constructs new container from a variety of data sources and optionally using user …
Erase
std::map ::erase
Extract
std::map ::extract
Map in C++ Standard Template Library (STL) - GeeksforGeeks
WEBJul 5, 2024 — Basic std::map Member Functions. Some basic functions associated with std::map are: begin () – Returns an iterator to the first element in the map. end () – Returns an iterator to the theoretical element that follows the last element in the map. size () – Returns the number of elements in the map.
std:: map - C++ Users
WEBMaps are associative containers that store elements formed by a combination of a key value and a mapped value, following a specific order. In a map, the key values are generally used to sort and uniquely identify the elements, while the mapped values store the content associated to this key.
- Question & Answer
C++ Map of Functions - GeeksforGeeks
WEBJan 23, 2023 — Map of functions is the type of map where rather than the value we attach a function with the key. This can be especially useful if you need to call a variety of functions at different times in your program, as it allows you to easily associate a name with each function and quickly look up and call the function you need. Syntax:
C++ Map - Programiz
- We can search for keys in a map using the find()function. Its syntax is For example, In the example above, we have used the find() function to search for the element of student that contains the key 2. Now, the find()function returns: 1. an iterator pointing to the element if the element exists 2. an iterator pointing to the end of the map, i.e., s...
C++ Map Explained with Examples - freeCodeCamp.org
WEBFeb 1, 2020 — map is a container that stores elements in key-value pairs. It's similar to collections in Java, associative arrays in PHP, or objects in JavaScript. Here are the main benefits of using map: map only stores unique keys, and the keys themselves are in …
c++ - Using a STL map of function pointers - Stack Overflow
WEBWell, you can use any_map to store functions with different signatures (but calling it will be messy) and you can use int_map to call functions with a specific signature (looks nicer).
<map> - C++ Users
WEBC++11 <cfenv> (fenv.h) <cfloat> (float.h) C++11 <cinttypes> (inttypes.h) ... Map header. Header that defines the map and multimap container classes: Classes map Map (class template) multimap Multiple-key map (class template) Functions begin Iterator to beginning (function template) end Iterator to end (function template)
map - C++ Users
WEBThe function template argument InputIterator shall be an input iterator type that points to elements of a type from which value_type objects can be constructed (in map, value_type is an alias of pair <const key_type, mapped_type>) x.
std::map<Key,T,Compare,Allocator>:: map - Reference
WEBNov 29, 2021 — Constructs new container from a variety of data sources and optionally using user supplied allocator alloc or comparison function object comp.
C++ Maps Explained with Examples - Udacity
WEBMar 19, 2020 — What are C++ maps and when should you use them? Learn C++ map best practices, including use cases and examples.
map Class | Microsoft Learn
WEBAPI reference for the C++ Standard Template Library (STL) `map` class, which is used for the storage and retrieval of data from a collection in which each element is a pair that has both a data value and a sort key.
Map in C++ Standard Template Library (STL) - Guru99
WEBAug 10, 2024 — What is Map in C++? Syntax. In C++, a MAP is an associative container storing items in a mapped form. Each item in the map is composed of key-value and a mapped value. Two mapped values cannot share the same key values. The key values are good for sorting and identifying elements uniquely.
Map in C++ (STL) - thisPointer
WEBstd::map is a Data Structure provided by Standard Template Library in C++. std::map is an Associative Container that store the data in key-value pairs. It internally uses a self-balancing Binary Search Tree (Red-Black tree) implementation to optimize its operations.
Traversing a Map and unordered_map in C++ STL - GeeksforGeeks
WEBJul 12, 2024 — The begin () and end () are the member functions of container classes that return the iterator to the first and the last key-value pair in a map or unordered_map respectively. We can use them to traverse over a map or an unordered_map. Example: map unordered_map.
map - C++ Users
WEBpublic member function. <map> std:: map::find. iterator find (const key_type& k);const_iterator find (const key_type& k) const; Get iterator to element. Searches the container for an element with a key equivalent to k and returns an iterator to it if found, otherwise it returns an iterator to map::end.
map::at() in C++ STL - GeeksforGeeks
WEBApr 19, 2024 — map::at () at () function is used to reference the element mapped to the key value given as the parameter to the function. For example, if we have a string “hi” mapped to an integer 1, then passing the integer 1 as the parameter of at () function will return the string “hi”. Syntax : mapname.at(key) Parameters :
Maps in C++ | Introduction to Maps with Example | Edureka
WEBNov 25, 2020 — What are Maps in C++ and how to implement it? Associative containers that store elements in a mapped fashion are called Maps. All the elements in a map are stored in a key-value pair where each key is unique. Sorting is done with the help of keys and the values are associated with each key.
c++ - Map functions of a class - Stack Overflow
WEBFeb 24, 2011 — You can use an std::map where the key is a string, and the value is a member function pointer, (or std::mem_fun_t object), but this will only work on a single class, and only on member functions with the same signature.
map - C++ Users
WEBReturns a reference to the mapped value of the element identified with key k. If k does not match the key of any element in the container, the function throws an out_of_range exception.
Map containing function pointers in C++ - Stack Overflow
WEBFeb 15, 2016 — The problem replace my if and else statements with a map that contains a string as a key and a function pointer as the value. However each function pointer can point to functions that have a different return type …
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