31edd48b43
* moved C++ examples to a new cxx folder in examples * added experimental C++ component * added ESPException class to the C++ experimental component * added test cases for ESPException and corresponding test macros
50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
# Example: C++ exception handling
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example demonstrates usage of C++ exceptions in ESP-IDF.
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By default, C++ exceptions support is disabled in ESP-IDF. It can be enabled using `CONFIG_COMPILER_CXX_EXCEPTIONS` configuration option.
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In this example, the `sdkconfig.defaults` file sets the `CONFIG_COMPILER_CXX_EXCEPTIONS` option. This enables both compile time support (`-fexceptions` compiler flag) and run-time support for C++ exception handling.
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The example source code declares a class which can throw exception from the constructor if the argument provided is equal to `0`. This is used to demonstrate that exceptions can be thrown and caught using standard C++ facilities.
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**Note: Due to the use of the C++ exceptions, this example is written in C++ instead of C.**
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## How to use example
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### Hardware Required
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This example should be able to run on any commonly available ESP32 development board.
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### Configure the project
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```
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idf.py menuconfig
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```
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### Build and Flash
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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```
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app_main starting
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In constructor, arg=42
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In constructor, arg=0
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In destructor, m_arg=42
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Exception caught: Exception in constructor
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app_main done
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```
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