NAME
A function of omni::application::shutdown_handler
omni::application::shutdown_handler::attach
A function of omni::application::shutdown_handler
#include <omni/application.hpp>void omni::application::shutdown_handler::attach(const omni::callback& shutdown_func)
DESCRIPTION
When a delegate is attached to the underlying
Calling this function after an
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When a delegate is attached to the underlying
shutdown handler, the delegate will be invoked before the omni::application::run function returns in the order it was attached.Calling this function after an
omni::application::run context has returned will have no effect since the run function will have already returned thus calling the delegates.
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ERRORS
If an exception occurs on an attached delegate, it will be handled according to
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If an exception occurs on an attached delegate, it will be handled according to
omni::sync::user_thread_exception and omni::sync::unhandled_thread_exception.
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CONSIDERATIONS
This function will only have an effect if you have explicitly called one of the
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This function will only have an effect if you have explicitly called one of the
omni::application::run functions to block the main thread until program completion.
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NOTES
Be aware that the
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Be aware that the
std::atexit function will call any functions in the reverse order registered. So if omni::application::run is called after any other calls to register a function with std::atexit in user code, then the underlying exit handler event will be called accordingly in order attached; in other words, if you were to call std::atexit(&some_function) then shutdown_handler::attach(&some_func) and call omni::application::run, the Omni exit handler will be called first, then some_function last. Calling this function after the shutdown handler has been called will have no effect on the handler since it will have already been called.
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EXAMPLE
Visit the examples page for more.
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#include <omni/application> void app_exit() { std::cout << "Application exiting" << std::endl; } void app_shutdown() { std::cout << "Application shutting down" << std::endl; } void app_run() { std::cout << "Leaving, waiting for CTRL+C" << std::endl; } int main(int argc, const char* argv[]) { omni::application::exit_handler::attach(&app_exit); omni::application::shutdown_handler::attach(&app_shutdown); return omni::application::run(&app_run); }
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