I'm trying to use constexpr for the first time in C++ on Mac. I am using sublime text but am compiling through terminal. Here is the command I'm using to compile:
g++ -o helloworld helloworld.cpp
Let me make something clear: I KNOW THIS QUESTION IS A DUPLICATE, but all the other questions were using xCode or VS Code, and since I'm using a text editor, not an IDE, then those answers don't apply to me. I know that people will ask for this, so here is what happens when I run the following command:
g++ --version
//...
Apple clang version 11.0.3 (clang-1103.0.32.29)
Target: x86_64-apple-darwin19.4.0
Thread model: posix
Here is the code:
#include <iostream>
constexpr int cube(int n){
return n*n*n;
}
int main(){
constexpr int hello = 2*cube(5);
auto niceNum = 69.420;
std::cout << hello << niceNum << "\n";
}
Here is the output:
helloworld.cpp:3:1: error: unknown type name 'constexpr'
constexpr int cube(int n){
^
helloworld.cpp:9:2: error: unknown type name 'constexpr'
constexpr int hello = 2*cube(5);
^
helloworld.cpp:10:2: warning: 'auto' type specifier is a C++11 extension
[-Wc++11-extensions]
auto niceNum = 69.420;
^
(There is also an error with the auto keyword, which I'm assuming is related to the constexpr issue, since they're both unique to C++, meaning they're not included in C) Thanks.
