Macro threadstack::push_thread_stack_value

macro_rules! push_thread_stack_value {
    ($new_value:expr, $thread_stack:expr) => { ... };
}

Push a new value on the top of the threadstack. This value becomes the value that will be returned by clone_thread_stack_value and that let_ref_thread_stack_value! will create a reference to. Can only be invoked inside a function, and the effect will last until the end of the current scope. Pushing a new value onto the threadstack will never panic. The assumption is that threadstacks are mostly used for infrequently set context data, or configuration settings that would otherwise be global variables.

use threadstack::*;

declare_thread_stacks!(
    FOO: String = String::from("hello world");
);

assert!(clone_thread_stack_value(&FOO) == "hello world");

{
    push_thread_stack_value!("hello universe".into(), FOO);
    assert!(clone_thread_stack_value(&FOO) == "hello universe");
}

assert!(clone_thread_stack_value(&FOO) == "hello world");