Learn How To Use C++ Variadic Templates For Windows Development With C++Builder

C++ Builder supports the Variadic templates. Variadic templates are template that take a variable number of arguments. Both the classes and functions can be variadic offered by C++11.

Templates have been a powerful feature in C++. Now, after the introduction of variadic templates, templates have proven themselves even more powerful. Variadic templates are a trustworthy solution to implement delegates and tuples.

Here’s a variadic class template:

template<typename... Arguments>
class VariadicTemplate {};

Any of the following ways to create an instance of this class template is valid:

VariadicTemplate<double, float> instance;
VariadicTemplate<bool, unsigned short int, long> instance;
VariadicTemplate<char, std::vector<int>, std::string, std::string, std::vector<long long>> instance;

Here’s a function template:

template void SampleFunction(Arguments… parameters) {};

The contents of the variadic template arguments are called parameter packs. These packs will then be unpacked inside the function parameters. For example, if you create a function call to the above variadic function template,

SampleFunction<int, int>(16, 24);

an equivalent function template would be like this:

template<typename T, typename U> 
void SampleFunction(T param1, U param2){};

Head over and find out more about C++ variadic templates in the Embarcadero DocWiki!