Struct synfx_dsp_jit::locked::LockedMutPtrs

pub struct LockedMutPtrs<T, E>where
    T: MutPointable<E>,{ /* private fields */ }

This type locks up a Vec<> after creation and gives you a pointer to a vector of mutable pointers: *const *mut T.

It locks away the interior std::vec::Vec instances, so that they can’t be accidentally changed while you are messing around with the pointers.

See also LockedPtrs for a mutable alternative to this type.

The type T must implement the MutPointable trait.

 use synfx_dsp_jit::locked::*;

 struct MyFFIStuff {
     data: LockedMutPtrs<Vec<f64>, f64>,
 }

 let ffistuff = MyFFIStuff {
     data: LockedMutPtrs::new(vec![vec![0.0; 10], vec![0.2; 30]]),
 };

 // We are guaranteed here, that the pointers here will not be
 // invalidated until MyFFIStuff is dropped!
 let pointers = ffistuff.data.pointers();

 unsafe {
     (*pointers[0]) = 10.0;
     (*pointers[0].offset(1)) = 11.0;
     (*pointers[1]) = 20.0;
 };

Implementations

impl<T, E> LockedMutPtrs<T, E>where
    T: MutPointable<E>,

pub fn new(v: Vec<T>) -> Self

pub unsafe fn swap_element(&mut self, idx: usize, elem: &mut T) -> Result<(), ()>

Swaps out one element in the locked vector.

Safety

You must not call this function while you still have pointers handed out. These pointers will be invaldiated by this function!

pub fn len(&self) -> usize

pub fn element_len(&self, idx: usize) -> usize

pub fn lens(&self) -> &[u64]

pub fn pointers(&self) -> &[*mut E]