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https://github.com/pybind/pybind11.git
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a0c1ccf0a9
Use simple asserts and pytest's powerful introspection to make testing simpler. This merges the old .py/.ref file pairs into simple .py files where the expected values are right next to the code being tested. This commit does not touch the C++ part of the code and replicates the Python tests exactly like the old .ref-file-based approach.
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*
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tests/test_custom-exceptions.cpp -- exception translation
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Copyright (c) 2016 Pim Schellart <P.Schellart@princeton.edu>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "pybind11_tests.h"
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// A type that should be raised as an exeption in Python
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class MyException : public std::exception {
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public:
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explicit MyException(const char * m) : message{m} {}
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virtual const char * what() const noexcept override {return message.c_str();}
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private:
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std::string message = "";
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};
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// A type that should be translated to a standard Python exception
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class MyException2 : public std::exception {
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public:
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explicit MyException2(const char * m) : message{m} {}
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virtual const char * what() const noexcept override {return message.c_str();}
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private:
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std::string message = "";
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};
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// A type that is not derived from std::exception (and is thus unknown)
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class MyException3 {
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public:
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explicit MyException3(const char * m) : message{m} {}
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virtual const char * what() const noexcept {return message.c_str();}
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private:
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std::string message = "";
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};
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// A type that should be translated to MyException
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// and delegated to its exception translator
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class MyException4 : public std::exception {
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public:
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explicit MyException4(const char * m) : message{m} {}
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virtual const char * what() const noexcept override {return message.c_str();}
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private:
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std::string message = "";
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};
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void throws1() {
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throw MyException("this error should go to a custom type");
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}
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void throws2() {
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throw MyException2("this error should go to a standard Python exception");
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}
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void throws3() {
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throw MyException3("this error cannot be translated");
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}
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void throws4() {
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throw MyException4("this error is rethrown");
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}
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void throws_logic_error() {
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throw std::logic_error("this error should fall through to the standard handler");
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}
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void init_ex_custom_exceptions(py::module &m) {
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// make a new custom exception and use it as a translation target
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static py::exception<MyException> ex(m, "MyException");
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py::register_exception_translator([](std::exception_ptr p) {
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try {
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if (p) std::rethrow_exception(p);
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} catch (const MyException &e) {
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PyErr_SetString(ex.ptr(), e.what());
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}
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});
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// register new translator for MyException2
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// no need to store anything here because this type will
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// never by visible from Python
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py::register_exception_translator([](std::exception_ptr p) {
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try {
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if (p) std::rethrow_exception(p);
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} catch (const MyException2 &e) {
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PyErr_SetString(PyExc_RuntimeError, e.what());
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}
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});
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// register new translator for MyException4
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// which will catch it and delegate to the previously registered
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// translator for MyException by throwing a new exception
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py::register_exception_translator([](std::exception_ptr p) {
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try {
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if (p) std::rethrow_exception(p);
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} catch (const MyException4 &e) {
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throw MyException(e.what());
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}
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});
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m.def("throws1", &throws1);
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m.def("throws2", &throws2);
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m.def("throws3", &throws3);
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m.def("throws4", &throws4);
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m.def("throws_logic_error", &throws_logic_error);
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}
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