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dft_tools/doc/reference/c++/arrays/debug.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:: python
.. _Debug:
Bound checking and debug macros
===================================
To be fast, by default, no check are made on the indices while accessing elements or slicing.
However, checks can be activated in two ways :
* Adding the `BOUND_CHECK` option
* Defining the debug macro TRIQS_ARRAYS_ENFORCE_BOUNDCHECK, which switches the default option to `BOUND_CHECK`
for all arrays, matrices and vectors.
In both cases, if the indices are not within the domain of defintion, an exception triqs::arrays::key_error
will be thrown. It's .what() returns the file and line where the exception occurs, with the stack of all in C++,
e.g. :
.. triqs_example:: ./debug_0.cpp
.. note:: Bound Checking is not necessarly used for debugging. You may used it for a given array, catching exception.
Beware however that bound checking comes with some performance penalty.