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#include <iostream>
 
template<typename T>
bool is_one_of(T const value, T const value1, T const ... values) {
    return value == value1 || is_one_of(value, values);
}
 
template<typename T>
bool is_one_of(T const value, T const value1) {
    return value == value1;
}
 
int main() {
        std::cout << is_one_of<int>(1, 2);
}
 

prog.cpp:4:59: error: expansion pattern ‘const T’ contains no argument packs
 bool is_one_of(T const value, T const value1, T const ... values) {
                                                           ^~~~~~
prog.cpp: In function ‘bool is_one_of(T, T)’:
prog.cpp:5:48: error: ‘values’ was not declared in this scope
     return value == value1 || is_one_of(value, values);
                                                ^~~~~~
prog.cpp:5:48: note: suggested alternative: ‘value’
     return value == value1 || is_one_of(value, values);
                                                ^~~~~~
                                                value
prog.cpp: At global scope:
prog.cpp:9:6: error: redefinition of ‘template<class T> bool is_one_of(T, T)’
 bool is_one_of(T const value, T const value1) {
      ^~~~~~~~~
prog.cpp:4:6: note: ‘template<class T> bool is_one_of(T, T)’ previously declared here
 bool is_one_of(T const value, T const value1, T const ... values) {
      ^~~~~~~~~

Standard output is empty