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Provides various utilities: class template std::pair (two-member tuples), compile-time integer sequences, helpers in constructing vocabulary types, functions such as std::move and std::forward, and many more. The namespace std::rel_ops for automatically generating comparison operators is deprecated in C++20 in favor of new defaulted comparison ...
Although namespaces are used extensively in recent C++ code, most older code does not use this facility because it did not exist in early versions of the language. For example, the entire C++ Standard Library is defined within namespace std, but before standardization
In the C++ Standard Library, several algorithms use unqualified calls to swap from within the std namespace. As a result, the generic std::swap function is used if nothing else is found, but if these algorithms are used with a third-party class, Foo, found in another namespace that also contains swap(Foo&, Foo&), that overload of swap will be used.
Access to C library functions via namespace ::std and the C++≥98 header names is preferred where possible. To encourage adoption, C++98 obsoletes the C ( *.h ) header names, so it’s possible that use of C compatibility headers will cause an especially strict C++98– 20 preprocessor to raise a diagnostic of some sort.
namespace std {template < class T, class Allocator = allocator < T > > class vector; // ... Like all C++ class templates, instantiations of standard library containers with different allocator arguments are distinct types .
Most of Library Fundamentals TS I, including: [29] [30] std::string_view, a read-only non-owning reference to a character sequence or string-slice [31]; std::optional, for representing optional objects, a data type that may not always be returned by a given algorithm with support for non-return
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One common property of all sequential containers is that the elements can be accessed sequentially. Like all other standard library components, they reside in namespace std. The following containers are defined in the current revision of the C++ standard: array, vector, list, forward_list, deque.