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C++:template

lastmod 2020-04-18created 2015-03-2015 edits

Template implementation

Suppose you have code like the following: 

template <typename T1, typename T2>
class SomeClass
{
    template <typename E>
    void extraTypedMethod(E & e);
};

You can separate the implementation as follows. 

template <typename T1, typename T2>
template <typename E>
void SomeClass<T1, T2>::extraTypedMethod(E & e)
{
    // ...
}

Template template parameter 

template <typename T, template <typename ELEM> class CONT = std::deque >
class Stack
{ /* ... */ };

Variadic template

A new ... expression that lets a template take a variable number of type arguments.

Variadic CRTP

The Curiously-Recurring Template Pattern (CRTP) is a pleasant and common C++ coding idiom. This installment of Once, Weakly combines CRTP with variadic template template parameter packs to implement restricted numeric types suitable for implementing memory-mapped devices.

Template Trees for Modern C++ Interfaces

Modern C++ increasingly uses “Do What I Mean” (DWIM) interfaces that depend on interface selection based on secondary properties of types. Often, these interfaces make use of SFINAE techniques and/or static assertions that require the ability to compose complex compile time queries about types. This installment of Once, Weakly describes the implementation and use of a simple facility for compile time composition and evaluation of abstract syntax trees (ASTs) of template predicates.

See also

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References

  1. Once-weakly20170328.pdf ↩

  2. Once-weakly20170215.pdf ↩

  3. C++_Templates_The_Complete_Guide.pdf ↩

  4. Users.cis.fiu.edu_-_Cpp_Templates_Tutorial.pdf ↩

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