Default (1)explicit vector (const allocatortype& alloc = allocatortype);fill (2)explicit vector (sizetype n); vector (sizetype n, const valuetype& val, const allocatortype& alloc = allocatortype);range (3)template vector (InputIterator first, InputIterator last, const allocatortype& alloc = allocatortype);copy (4)vector (const vector& x);vector (const vector& x, const allocatortype& alloc);move (5)vector (vector&& x);vector (vector&& x, const allocatortype& alloc);initializer list (6)vector (initializerlist il, const allocatortype& alloc = allocatortype). (1) empty container constructor (default constructor) Constructs an container, with no elements. (2) fill constructor Constructs a container with n elements. Each element is a copy of val. (3) range constructor Constructs a container with as many elements as the range first,last), with each element constructed from its corresponding element in that range, in the same order. (4) copy constructor Constructs a container with a copy of each of the elements in x, in the same order.The container keeps an internal copy of alloc, which is used to allocate storage throughout its lifetime.The copy constructor (4) creates a container that keeps and uses a copy of x's allocator.The storage for the elements is allocated using this.
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(1) empty container constructor (default constructor) Constructs an container, with no elements. (2) fill constructor Constructs a container with n elements. Each element is a copy of val (if provided). (3) range constructor Constructs a container with as many elements as the range first,last), with each element emplace-constructed from its corresponding element in that range, in the same order.
(4) copy constructor (and copying with allocator) Constructs a container with a copy of each of the elements in x, in the same order. (5) move constructor (and moving with allocator) Constructs a container that acquires the elements of x.If alloc is specified and is different from x's allocator, the elements are moved. Otherwise, no elements are constructed (their ownership is directly transferred).x is left in an unspecified but valid state.
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(6) initializer list constructor Constructs a container with a copy of each of the elements in il, in the same order.The container keeps an internal copy of alloc, which is used to allocate and deallocate storage for its elements, and to construct and destroy them (as specified by its ).
A constructor in Java is a block of code similar to a method that’s called when an instance of an object is created. Here are the key differences between a constructor and a method: A constructor doesn’t have a return type. The name of the constructor must be the same as the name of the. A constructor in C is a special method that is automatically called when an object of a class is created. To create a constructor, use the same name as the class, followed by parentheses.
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