C++ operators

[tidal wasp]

Why can I not use the operator+(a,b) syntax on ints

[mental oyster]

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[timid gale]

You can only define operators for overloads containing at least 1 non primative type

Oh wait... are you talking about calling the operator?

Calling using operator+ isn't syntactic sugar, but an actual function call.
operator+(int, int) isn't a defined function, as operation on primitives are built-in so to speak

[cinder anchor]

I remember that being the case too, but I wasn’t able to find a reference

Where would I find that?

[timid gale]

I didn't find a reference, I just tried defining it and got an error

[cinder anchor]

👍

[timid gale]

;compile

int operator+(int, int);
int main() {}

[magic pollen]

Compiler Output

<source>:1:5: error: 'int operator+(int, int)' must have an argument of class or enumerated type
    1 | int operator+(int, int);
      |     ^~~~~~~~
Build failed

ZeroPointer#6105 | c++ | x86-64 gcc 13.1 | godbolt.org

[cinder anchor]

http://www.eel.is/c++draft/over.oper#general-7

[timid gale]

There we go :D

[tidal wasp]

ok

the cursed code that code have been made ...

[cinder anchor]

Just make a class named Int 😉

[tidal wasp]

good point

[gilded barn]

;compile

template <typename T>
T operator+(T lhs, T rhs) { return lhs + rhs; }
int main() { return operator+(0, 0); }

[magic pollen]

Compiler Output

<source>: In function 'int main()':
<source>:3:30: error: no matching function for call to 'operator+(int, int)'
    3 | int main() { return operator+(0, 0); }
      |                     ~~~~~~~~~^~~~~~
<source>:2:3: note: candidate: 'template<class T> T operator+(T, T)'
    2 | T operator+(T lhs, T rhs) { return lhs + rhs; }
      |   ^~~~~~~~
<source>:2:3: note:   template argument deduction/substitution failed:
<source>: In substitution of 'template<class T> T operator+(T, T) [with T = int]':
<source>:3:30:   required from here
<source>:2:3: error: 'T operator+(T, T) [with T = int]' must have an argument of class or enumerated type
Build failed

el nora#8442 | c++ | x86-64 gcc 13.1 | godbolt.org

[gilded barn]

awwww

[solar galleon]

!solved