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A container defined as std::vector<Shape<Circle>*> can only store Circles, not Squares. This is because each of the classes derived from the CRTP base class Shape is a unique type. A common solution to this problem is to inherit from a shared base class with a virtual destructor, like the AbstractShape example above, allowing for the creation ...
Expression templates are a C++ template metaprogramming technique that builds structures representing a computation at compile time, where expressions are evaluated only as needed to produce efficient code for the entire computation. [1]
The C++ Standard Library provides several generic containers, functions to use and manipulate these containers, function objects, generic strings and streams (including interactive and file I/O), support for some language features, and functions for common tasks such as finding the square root of a number.
If the expression e refers to a variable in local or namespace scope, a static member variable or a function parameter, then the result is that variable's or parameter's declared type; Otherwise, if e is an lvalue, decltype(e) is T&, where T is the type of e; if e is an xvalue, the result is T&&; otherwise, e is a prvalue and the result is T.
This is a list of operators in the C and C++ programming languages.All the operators (except typeof) listed exist in C++; the column "Included in C", states whether an operator is also present in C. Note that C does not support operator overloading.
Making the text message for static_assert optional [5] Allow typename (as an alternative to class) in a template template parameter [6] New rules for auto deduction from braced-init-list [7] [8] Nested namespace definitions, e.g., namespace X:: Y {…} instead of namespace X {namespace Y {…}} [8] [9] Allowing attributes for namespaces and ...
The use of templates as a metaprogramming technique requires two distinct operations: a template must be defined, and a defined template must be instantiated.The generic form of the generated source code is described in the template definition, and when the template is instantiated, the generic form in the template is used to generate a specific set of source code.
The variadic template feature of C++ was designed by Douglas Gregor and Jaakko Järvi [1] [2] and was later standardized in C++11. Prior to C++11, templates (classes and functions) could only take a fixed number of arguments, which had to be specified when a template was first declared.