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