How template(General/Variadic) functionality implemented in C++ Compiler

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Hi,

Do not take this question as a complex one.What I want to know is,Which mechanisms are being used by compiler developers to implement both general "template" and "variadic template" functionality.I've researched about this topic and found some optional mechanisms such as "C style preprocessing trick" and structured template fucntions.
And I have found following link also,
http://stackoverflow.com/questions/7683041/how-to-implement-variadic-template-with-pre-c0xvs2008[^]

Mainly I want to know is How can we implement variadic template like scenario in older C++ compiler(do not take this as reinventing the wheel).Please post replies,if you can provide some useful links or sources.
Thank you.
(Sorry for my bad english)

Posted 4-Feb-15 23:07pm

Buddhi Chaturanga

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Richard MacCutchan 5-Feb-15 6:10am

Which mechanisms are being used by compiler developers
Only the compiler developers could answer that question.

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Mike Nordell · Answer 1 · 2015-02-07T15:59:00

Based on the initial "Do not take this question as a complex one.", I can only conclude the only valid answer is NULL, SEGV, or NaN.

Templates themselves are devilisly hard to get right. Variadic templates are ... harder.

Mainly I want to know is How can we implement variadic template like scenario in older C++ compiler
Not possible. You'd need a complete C++ parser to understand it, and by then you already have the whole AST to send to the backend. In MS-parlance, you'd have to implement a c1xxEXTRAPLUS.dll, and then simply hand it off to c2.dll. There is no way to (reasonably and reliably) convert C++ 11 code into C++ 98 code.