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https://en.wikipedia.org/wiki/Variadic_template
The variadic template feature of C++ was designed by Douglas Gregor and Jaakko Järvi 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.
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.cbclx01/variadic_templates.htm
To partially alleviate this problem in the existing C++ programs, you could use overloaded function templates that had a different number of parameters or extra defaulted template parameters. With the variadic templates feature, you can define class or function templates that have any number (including zero) of parameters.
https://en.cppreference.com/w/cpp/language/parameter_pack
A template parameter pack is a template parameter that accepts zero or more template arguments (non-types, types, or templates). A function parameter pack is a function parameter that accepts zero or more function arguments. A template with at least one parameter pack is called a variadic template.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=20599
For the record, I'm strongly in favor of variadic templates. Key parts of TR1 (tuple, functional) necessitate some kind of compiler support in order to have full implementations: the current limits …
http://www.cplusplus.com/articles/EhvU7k9E/
May 03, 2012 · 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. And, instead of C-style ellipsis mechanism, variadic templates can offer a typesafer solution to replace them.
https://www.florianjw.de/en/variadic_templates.html
Using Variadic Templates cleanly. ... The answer is basically that we cannot create a variadic number of statements from one expression and therefore we need to find a way to dispose of all the expressions, ... But let’s get back to usefull stuff instead of looking at ways to support those who cannot get an even somewhat recent compiler.
https://en.cppreference.com/w/c/variadic
Variadic functions are functions (e.g. printf) which take a variable number of arguments. The declaration of a variadic function uses an ellipsis as the last parameter, e.g. int printf (const char * format, ...);. See variadic arguments for additional detail on the syntax and automatic argument conversions.va_arg: accesses the next variadic function …
https://eli.thegreenplace.net/2014/variadic-templates-in-c/
Oct 24, 2014 · Variadic templates. One of the new features of C++11 is variadic templates.Finally, there's a way to write functions that take an arbitrary number of arguments in a type-safe way and have all the argument handling logic resolved at compile-time, rather than run-time.
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