• Pairs can be two values of the same type, but they can also contain values of a different type. Pairs are often used to hold two pieces of related data.
  • To access the elements, we use variable name followed by dot operator followed by the keyword first or second. Syntax: pair <data_type1, data_type2> Pair_name.
  • std::pair is a class template that provides a way to store two heterogeneous objects as a single unit. A pair is a specific case of a std::tuple with two elements.
  • # Creating a Pair and accessing the elements. Pair allows us to treat two objects as one object. ... operator== tests if both elements on lhs and rhs pair are equal.
  • The syntax to declare nested pairs in C++ is as follows : Parameters: Here, we have a nested pair, i.e., a pair's first or second element is itself a pair.
  • The second constructor initializes the first element of the pair to Val1 and the second to Val2. It is defined if both types are copy-constructible.
  • you can't use dictionary how would store the pairs (a,b) and (a,c). Pairs concept should not be confused with associative look up of key and values.
  • The C# doesn’t provide any built-in implementation of the Pair class, but starting from .NET 4.0, you can use tuples to implement a pair-like structure
  • The std::pair template takes two template parameters, P1 and P2, representing the types of the two values in the pair.
  • In this comprehensive guide, we‘ll explore everything you need to know about using pair containers and functions effectively in your C++ programs.