c++ - Variadic Template Functions: No matching function for call, std::endl

In my code, I use variadic template functions for the logging purpose. But when I use std::endl as parameter, I get the following compiler error:

Error: no matching function for call to 'LOG_ERROR(const char [14],
int&, )' LOG_ERROR("Sum of x+y
= ", z, std::endl);

note: candidate: 'void LOG_ERROR()' inline void LOG_ERROR() {

note: candidate expects 0 arguments, 3 provided

My Code:

#include 

inline void LOG_ERROR() { 
    std::cout << std::endl;
}

template
void LOG_ERROR(First && first, Rest && ...rest){
    std::cout << std::forward(first);
    LOG_ERROR(std::forward(rest)...);
}

int main() {
    int foo=40;
    LOG_ERROR("My foo = ", foo, std::endl);
}

The code works fine with "\n" but I would love to learn why it fails with std::endl and how I can fix it

Answer

std::endl is not a character type or any other type. It is output stream manipulator. Its return type is output stream.

So, you can not pass it without typecasting. Please look here