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#include <iostream>
#include <mutex>
using namespace std;
 
std::once_flag flag;
 
template<typename ...Args>
void gFunc(Args... args)
{
}
 
template<typename ...Args>
void func(Args... args)
{
	auto lm = [&, args...] 
	          {
	          	// more code here
	            return gFunc(args...);
	          };
    std::call_once(flag,lm);
}
 
int main() {
	// your code goes here
	func(1);
	return 0;
}

prog.cpp: In function ‘void func(Args ...)’:
prog.cpp:15:20: error: expected ‘,’ before ‘...’ token
  auto lm = [&, args...] 
                    ^
prog.cpp:15:20: error: expected identifier before ‘...’ token
prog.cpp:15:23: error: parameter packs not expanded with ‘...’:
  auto lm = [&, args...] 
                       ^
prog.cpp:15:23: note:         ‘args’
prog.cpp: In lambda function:
prog.cpp:18:31: error: expansion pattern ‘args’ contains no argument packs
              return gFunc(args...);
                               ^
prog.cpp: In instantiation of ‘struct func(Args ...) [with Args = {int}]::__lambda0’:
prog.cpp:19:12:   required from ‘void func(Args ...) [with Args = {int}]’
prog.cpp:25:8:   required from here
prog.cpp:15:16: error: using invalid field ‘func(Args ...)::__lambda0::__args’
  auto lm = [&, args...] 
                ^

Standard output is empty