Is tuple a pair?

Tuples are immutable and ordered sequences of elements. They’re commonly used to represent pairs – tuples of two elements. Java has great support for immutable lists (and other collections), but not a great one for pairs.

What is std :: tuple?

Class template std::tuple is a fixed-size collection of heterogeneous values. It is a generalization of std::pair. If std::is_trivially_destructible::value is true for every Ti in Types , the destructor of tuple is trivial.

Is a pair a STD?

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. If neither T1 nor T2 is a possibly cv-qualified class type with non-trivial destructor, or array thereof, the destructor of pair is trivial.

When would you use a tuple over a struct?

So, use tuples when you want to return two or more arbitrary pieces of values from a function, but prefer structs when you have some fixed data you want to send or receive multiple times.

Why is tuple immutable?

Tuples and lists are the same in every way except two: tuples use parentheses instead of square brackets, and the items in tuples cannot be modified (but the items in lists can be modified). We often call lists mutable (meaning they can be changed) and tuples immutable (meaning they cannot be changed).

What is a tuple vs list?

Tuples and Lists: Key differences The key difference between the tuples and lists is that while the tuples are immutable objects the lists are mutable . This means that tuples cannot be changed while the lists can be modified.

Are C++ tuples mutable?

The tuple itself isn’t mutable (i.e. it doesn’t have any methods that for changing its contents). Likewise, the string is immutable because strings don’t have any mutating methods. The list object does have mutating methods, so it can be changed.

What library is STD pair in?

Pair is used to combine together two values that may be of different data types. Pair provides a way to store two heterogeneous objects as a single unit.

How do you declare a STD pair?

Constructs a new pair. 1) Default constructor. Value-initializes both elements of the pair, first and second ….See also.

make_pair	creates a pair object of type, defined by the argument types (function template)
(constructor) (C++11)	constructs a new tuple (public member function of std::tuple )

Is tuple faster than struct?

Now our struct is slightly faster than that of a tuple now (around 3% with clang and less than 1% with gcc), however, we do need to write our customized swap function for all of our structs.

Is a tuple a struct or class?

A tuple is a data structure that has a specific number and sequence of elements.