function in C++

[anhnha]

Hi,
I am new to C++ and please help me with some problems.
Here is a code that I am confused.

struct SFoo
{
   //...
};
 
class CFoo
{
   //...
};
 
void func1(SFoo foo) {/*...*/}
void func2(CFoo foo) {/*...*/}
void func3(SFoo& foo) {/*...*/}
void func4(CFoo& foo) {/*...*/}

Could you explain what is SFoo& and CFoo&?
Is there any difference between CFoo& foo and CFoo &foo?

[AbstractionAnon]

func3 and func4 pass foo by reference, while func1 and func2 pass foo by value.
http://www.learncpp.com/cpp-tutorial/73-passing-arguments-by-reference/
http://www.learncpp.com/cpp-tutorial/72-passing-arguments-by-value/

Is there any difference between CFoo& foo and CFoo &foo

whitespace before or after the & makes no difference.

[anhnha]

Thanks! These are great tutorials. I understand much more than just reading books.

whitespace before or after the & makes no difference

BTW, out of curiosity, why is that?

[MiiNiPaa]

BTW, out of curiosity, why is that?

Because standard defines it that way.
As whitespaces do not make difference for operators: a+b ≈ a +b ≈ a+ b ≈ a + b; they do not matter when you would place * or &: int& a ≈ int &a ≈ int & a ≈ int&a

[anhnha]

Thank you, MiiNiPaa.
I have no problem with whitespaces in a + b but int& a ≈ int &a ≈ int & a ≈ int&a are really new to me.
Really interesting!