b3-core 0.4.0

A cross-platform framework that provides access and management of the main elements of a graphical application.
Documentation 
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use std::{
    any::Any,
    cell::Cell,
    panic::{RefUnwindSafe, UnwindSafe},
};

#[derive(Default)]
pub struct PanicInfo {
    inner: Cell<Option<Box<dyn Any + Send + 'static>>>,
}

// WARNING:
// As long as this struct is used through its `impl`, it is UnwindSafe.
// (If `get_mut` is called on `inner`, unwind safety may get broken.)
impl UnwindSafe for PanicInfo {}
impl RefUnwindSafe for PanicInfo {}
impl PanicInfo {
    pub fn is_panicking(&self) -> bool {
        let inner = self.inner.take();
        let result = inner.is_some();
        self.inner.set(inner);
        result
    }

    /// Overwrites the current state if the current state is not panicking
    pub fn set_panic(&self, p: Box<dyn Any + Send + 'static>) {
        if !self.is_panicking() {
            self.inner.set(Some(p));
        }
    }

    pub fn take(&self) -> Option<Box<dyn Any + Send + 'static>> { self.inner.take() }
}