reg. constructor parameters

[Pelle Beckman]

Hi all,

I have these classes (for a GUI library) that uses
alot of variables that need to be set at c-tor time

i.e.

class Button : Widget {
public:
Button (int x, int y) : Widget (BUTTON),
m_x (x),
m_y (y),
name (""),
etc /.../

Is it true that this generates better (meaning faster)
code than doing this?

Button (int x, int y) {
this->m_x = x;
this->m_y = y;
etc /.../

Thanks.

-- Pelle

 

[Victor Bazarov]

I have these classes (for a GUI library) that uses
alot of variables that need to be set at c-tor time

i.e.

class Button : Widget {
public:
Button (int x, int y) : Widget (BUTTON),
m_x (x),
m_y (y),
name (""),
etc /.../

Is it true that this generates better (meaning faster)
code than doing this?

Button (int x, int y) {
this->m_x = x;
this->m_y = y;
etc /.../

Generally speaking, yes. Please refer to FAQ. Search for "assignment
initialization".

V

 

[Jaspreet]

Hi all,

I have these classes (for a GUI library) that uses
alot of variables that need to be set at c-tor time

i.e.

class Button : Widget {
public:
Button (int x, int y) : Widget (BUTTON),
m_x (x),
m_y (y),
name (""),
etc /.../

Is it true that this generates better (meaning faster)
code than doing this?

Button (int x, int y) {
this->m_x = x;
this->m_y = y;
etc /.../

Thanks.

-- Pelle

Yes almost always but there is just 1 exception to the rule. Pls go
through
http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.6

 

[pven]

Yes almost always but there is just 1 exception to the rule. Pls go

through
http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.6

Hi, is there any effect in applying this when having virtual
inheritance.