fork(1) download

copy

#include <iostream>
 
using namespace std;
 
void foo(const bool is_int, const void* param) {
    if(is_int) {
    	const int* const* ptr = param;
 
        cout << "int**: " << *ptr << endl;
    } else {
    	const double* ptr = param;
 
        cout << "double*: " << *ptr << endl;
    }	
}
 
int main() {
	const auto int_num = 1020;
	const auto int_ptr = &int_num;
	const auto double_num = 1020.7;
	const auto double_ptr = &double_num;
 
	foo(true, &int_ptr);
	//foo(true, reinterpret_cast<const void*>(&int_ptr));
	foo(false, double_ptr);
	//foo(false, reinterpret_cast<const void*>(double_ptr));
}

prog.cpp: In function ‘void foo(bool, const void*)’:
prog.cpp:7:30: error: invalid conversion from ‘const void*’ to ‘const int* const*’ [-fpermissive]
      const int* const* ptr = param;
                              ^~~~~
prog.cpp:11:26: error: invalid conversion from ‘const void*’ to ‘const double*’ [-fpermissive]
      const double* ptr = param;
                          ^~~~~

Standard output is empty