Web Reference: Nov 10, 2024 · Constructs a new vector from a variety of data sources, optionally using a user supplied allocator alloc. 1) The default constructor since C++11. Constructs an empty vector with a default-constructed allocator. If Allocator is not DefaultConstructible, the behavior is undefined. 2) The default constructor until C++11. Mar 14, 2011 · You can use it to construct the std::vector containing N copies of x. The default value for x is a value initialized T (if T is a class type with a default constructor then value initialization is default construction). Member type allocator_type is the internal allocator type used by the container, defined in vector as an alias of its second template parameter (Alloc). If allocator_type is an instantiation of the default allocator (which has no state), this is not relevant.
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