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Re: Know what you're using. Size of some common types. [message #57934 is a reply to message #57933]

Wed, 29 December 2021 01:42

Lance is currently offline

Lance
Messages: 656
Registered: March 2007

Contributor

Agreed. Here the waste on suboptimal alignment (or possible gain by rearrange member vars to arrive at the least waste on padding) is insignificant comparing to the size of the object(of the class).

I do believe we should pay some more attention to the order we declare struct/class member variable to arrive at more efficient memory usage. I come across bitfields separated by other type of variable once in a while. The ScrollBar class is an example of this.

private:
	int     thumbpos;
	int     thumbsize;
	bool    horz:1;
	bool    jump:1;
	bool    track:1;
	int     delta;
	int8    push;
	int8    light;

	Button  prev, prev2, next, next2;
	int     pagepos;
	int     pagesize;
	int     totalsize;
	int     linesize;
	int     minthumb;
	bool    autohide:1;
	bool    autodisable:1;
	bool    is_active:1;

But this are overall of a less degree of concern. The percentage saving is usual immaterial.

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[Message index]

		Know what you're using. Size of some common types. By: Lance on Mon, 27 December 2021 19:33
		Re: Know what you're using. Size of some common types. By: Klugier on Mon, 27 December 2021 19:58
		Re: Know what you're using. Size of some common types. By: Lance on Mon, 27 December 2021 20:32
		Re: Know what you're using. Size of some common types. By: Lance on Mon, 27 December 2021 20:37
		Re: Know what you're using. Size of some common types. By: Klugier on Mon, 27 December 2021 21:42
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 28 December 2021 02:29
		Re: Know what you're using. Size of some common types. By: Novo on Tue, 28 December 2021 05:17
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 28 December 2021 20:27
		Re: Know what you're using. Size of some common types. By: Novo on Tue, 28 December 2021 23:49
		Re: Know what you're using. Size of some common types. By: Lance on Wed, 29 December 2021 01:42
		Re: Know what you're using. Size of some common types. By: Lance on Thu, 30 December 2021 02:39
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 31 December 2021 19:51
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 31 December 2021 20:20
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 31 December 2021 20:28
		Re: Know what you're using. Size of some common types. By: mirek on Wed, 05 January 2022 10:47
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 07 January 2022 17:25
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 07 January 2022 17:44
		Re: Know what you're using. Size of some common types. By: mirek on Fri, 07 January 2022 18:34
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 07 January 2022 19:01
		Re: Know what you're using. Size of some common types. By: Lance on Fri, 07 January 2022 19:26
		Re: Know what you're using. Size of some common types. By: mirek on Fri, 07 January 2022 22:22
		Re: Know what you're using. Size of some common types. By: Lance on Sun, 09 January 2022 20:36
		Re: Know what you're using. Size of some common types. By: mirek on Mon, 10 January 2022 01:07
		Re: Know what you're using. Size of some common types. By: Lance on Mon, 10 January 2022 02:00
		Re: Know what you're using. Size of some common types. By: Lance on Mon, 10 January 2022 21:43
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 11 January 2022 02:29
		Re: Know what you're using. Size of some common types. By: mirek on Tue, 11 January 2022 13:41
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 11 January 2022 15:19
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 11 January 2022 17:40
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 11 January 2022 22:07
		Re: Know what you're using. Size of some common types. By: Lance on Tue, 11 January 2022 22:25
		Re: Know what you're using. Size of some common types. By: mirek on Wed, 11 May 2022 09:42
		Re: Know what you're using. Size of some common types. By: Novo on Thu, 12 May 2022 08:26
		Re: Know what you're using. Size of some common types. By: Lance on Sat, 14 May 2022 21:30
		Re: Know what you're using. Size of some common types. By: mirek on Fri, 07 January 2022 18:32

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