Friend template variadic function

Asked Feb 13 '17 at 11:37

Active Feb 13 '17 at 11:49

Viewed 136 times

I'm defining this variadic template function that I want to use use for parameter validation:

class Text
{
  template <typename ... T> friend void strfmt(char *dest,int size,const T & ... v)
  {sprintf_s(dest,size,_valchk(v) ...);}

public:
  // other functions in class
};

_valchk is a set of private member functions of same class.

When I use strfmt, with any kind of parameter, compiler issues an error.

Example:

char buf[10];
strfmt(buf,sizeof(buf),"%d",10);

strfmt: unknown identifier

Why?

edited Feb 13 '17 at 11:49

asked Feb 13 '17 at 11:37

Galaxian

1

Please provide a [mcve]. The snippet looks like it is placed inside a class definition. Is it? How do you instantiate the template? – 463035818_is_not_an_ai Feb 13 '17 at 11:38
Following [this](http://stackoverflow.com/a/23541148/3953764), you should *declare* `strfmt` outside of the class. – Piotr Skotnicki Feb 13 '17 at 12:12

Friend template variadic function

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