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dft_tools/doc/reference/c++/arrays/lazy.rst
Olivier Parcollet 3fe400d34c doc : split c++ code from rst
- examples split from the rst file using a python script (split_code).
- Final result for the doc is unchanged.
- examples are compiled and tested with the other tests.
- examples' code have been clang-formatted, with triqs style.
- doc compiles much faster, and with the same options as the rest of the
  test.
- examples are added as tests, so they are run by make test, as simple C
  tests.
- done for the tutorials and the reference.
- autocompile removed (changed into triqs_example directive).
- add triqs_example :
   - make a literal include of the source code.
   - runs the compiled example
   - add, as before, the result to the source code in the doc.
- added the script split_code, used to make the changes automatically,
  maybe for later reuse. (in _tools)
2014-05-31 23:00:16 +02:00

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.. highlight:: c
.. _Lazy:
Interaction with CLEF expressions
============================================
* The containers and their view classes can be used with the :doc:`../clef/contents` library :
* They can be called with CLEF expressions.
* :doc:`Automatic assignment<../clef/assign>` has been set up.
* Using the CLEF library offers a quick and efficient way to fill an array with multiple advantages :
* It is simpler and more readeable than a series of for loops.
* It is usually more optimal since the for loops are automatically written in the TraversalOrder of the array.
* **Example** :
.. triqs_example:: ./lazy_0.cpp
.. note::
The syntax uses a <<, not = since the array is not assigned to an expression
but filled by the evaluation thereof.