CODEWITHSUNDEEP
c++
user7811364
user7811364

Reputation:

Where are built-in operators defined?

Where are the operators such as + or - defined?

E.G. Where can I see the code that says + means add two items together?

Was reading through this but I must not be seeing the basic 1 + 1 = 2 case in the standard library section. An example of this is shown in the "Additive Operators" section, yet I cant find a location of the function definition.

Upvotes: 0

Views: 139

Answers (4)

rici
rici

Reputation: 241671

In C++, there is no operator+(int,int). The addition operator is built-in and no function corresponds to it. In particular, you cannot do this:

using intDyadic = int(*)(int, int);
intDyadic add = operator+(int,int);

By contrast, you could create a function pointer to an operator override defined in a library, including the standard library.

Upvotes: 0

πάντα ῥεῖ
πάντα ῥεῖ

Reputation: 1

yet I cant find a location of the function definition.

There might not be a function definition at all, but a simple assembly instruction set:

mov 1,r1
mov 5,r2
add r1,r2

Upvotes: 0

user2100815
user2100815

Reputation:

The compiler generates the code for these operations - they are not part of the Standard Library. Your compiler will almost certainly have an option to allow you to examine the generated assembly language code.

Upvotes: 2

R. Daisy
R. Daisy

Reputation: 11

This is part of the language itself... the compiler translate the string "c=a+b;" to add the value stored in a to the value stored in b and set the result to c.

Upvotes: 0

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