[Help]Accessing structs efficiency

[monday]

Hi, is there usually a difference between the following 2 examples in terms of speed?

var[555][555][555][555] += 1
var[555][555][555][555] += 1
var[555][555][555][555] += 1
var[555][555][555][555] += 1
var[555][555][555][555] += 1
var[555][555][555][555] += 1

copy = var[555][555][555][555]
copy += 1
copy += 1
copy += 1
copy += 1
copy += 1
copy += 1
var[555][555][555][555] = copy

 

[y0mike]

nah

5char

 

[0x_]

If you copy the array instead of taking a reference to the value or accessing it directly yes because you then allocate memory which costs time.

Also, your example is barely logical as it won't work in a real world scenario (.. or do you use std::array?).

We / I can only give right information if we get your idea also.

 

[monday]

thanks, the idea is nothing specific, I had a little fear that writing long instructions which include long "paths" to the data like: var[555][555][555][555][555][555][555][555][555] would decrease the speed

 

[0x_]

The allocation will take longer yes, but access will happen in constant time as there's no traversal needed.
How's that possible?: Memory = RAM = Random access memory (as a little hint).