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//! Pool of VM memory instances for reuse.

use crate::interpreter::{
    Memory,
    MemoryInstance,
};

/// Trait for a VM memory pool.
pub trait VmMemoryPool: Sync {
    /// The memory instance returned by this pool.
    type Memory: Memory + Send + Sync + 'static;

    /// Gets a new VM memory instance from the pool.
    fn get_new(&self) -> Self::Memory;
}

/// Dummy pool that just returns new instance every time.
#[cfg(any(test, feature = "test-helpers"))]
#[derive(Default, Clone)]
pub struct DummyPool;

#[cfg(any(test, feature = "test-helpers"))]
impl VmMemoryPool for DummyPool {
    type Memory = MemoryInstance;

    fn get_new(&self) -> Self::Memory {
        MemoryInstance::new()
    }
}