mirror of
https://github.com/triqs/dft_tools
synced 2024-12-26 14:23:38 +01:00
25 lines
817 B
ReStructuredText
25 lines
817 B
ReStructuredText
.. highlight:: c
|
|
|
|
FAQ
|
|
======
|
|
|
|
How do I iterate on my array ?
|
|
-----------------------------------
|
|
|
|
|
|
There are different way to iterate on the element of an array, recommended in this order from the most simple/efficient to the most complex/slow :
|
|
|
|
* To assign data into an array, the simplest and efficient way is to use
|
|
automatic assignment with lazy expressions, Cf :ref:`Lazy`.
|
|
|
|
* For a more general case, where one does not simply assign a value to the array element,
|
|
use a *foreach* construct, Cf :ref:`Foreach`.
|
|
|
|
* You can use STL algorithms, since arrays have STL compliant iterators.
|
|
The performance may be lower than *foreach* loops (never better anyhow).
|
|
|
|
* Of course, one can still use a simple for loop, but this is not recommended in general
|
|
since it is more error prone and less optimal.
|
|
|
|
|