mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
57 lines
1.7 KiB
ReStructuredText
57 lines
1.7 KiB
ReStructuredText
|
|
.. highlight:: c
|
|
|
|
.. _util_exceptions:
|
|
|
|
Exceptions
|
|
=============================
|
|
|
|
|
|
TRIQS defines special exceptions, with the following characteristics :
|
|
|
|
* they derives from std::exceptions and have the interface
|
|
* their .what() contains :
|
|
|
|
* the file and line where the exception occurred
|
|
* an additionnal error message (see example below). The error behaves like a std::stringstream,
|
|
one can accumulate any message
|
|
* a complete stack strace of the C++ code at the exception point, with demangling of the function name (on gcc and clang).
|
|
* the boost python interface catches these exceptions and report all the information , for debugging.
|
|
So instead of having "Unknown exception in C++", you have a complete trace of the problem that occurred.
|
|
|
|
.. warning::
|
|
|
|
For uniformity, it is highly recommended to use these macros when developing for TRIQS.
|
|
|
|
Example of use ::
|
|
|
|
#include <triqs/utility/exceptions.hpp>
|
|
|
|
...
|
|
if (!condition) TRIQS_RUNTIME_ERROR <<" The value of a = "<<a<<" is not in the expected range" << R;
|
|
...
|
|
|
|
List of available exceptions :
|
|
|
|
* TRIQS_RUNTIME_ERROR.
|
|
|
|
This macro is simply ::
|
|
|
|
#define TRIQS_RUNTIME_ERROR throw triqs::runtime_error()<<" Triqs runtime error at "<<__FILE__<< " : "<<__LINE__<<"\n\n Trace is :\n\n"<<triqs::utility::stack_trace()<<"\n"
|
|
|
|
So it can be catched with the `triqs::runtime_error` type, e.g. ::
|
|
|
|
#include <triqs/utility/exceptions.hpp>
|
|
|
|
try {
|
|
...
|
|
if (!condition) TRIQS_RUNTIME_ERROR <<" The value of a = "<<a<<" is not in the expected range" << R;
|
|
...
|
|
}
|
|
catch (triqs::runtime_error const & e) {
|
|
std::cout << "caught error "<< e.what()<<std::endl;
|
|
}
|
|
|
|
|
|
|