Struct MemVfs 

pub struct MemVfs;

The sealed test world’s VFS: an in-memory filesystem that bridges the crate::testworld thread-local, so Given a file … seeds and Vfs-backed Read/Write statements share ONE source of truth. Installed per-test by the largo test runner; there is no real disk behind it (unless the test grants the filesystem capability, which routes it to a real NativeVfs instead). Its body only reads and writes the testworld thread-local, so it is equally at home behind either Vfs shape — the in-browser guide’s page test runner drives it through the ?Send one.

Implementations

impl MemVfs

pub fn new() -> Self

Trait Implementations

impl Default for MemVfs

fn default() -> Self

Returns the “default value” for a type.

impl Vfs for MemVfs

fn read<'life0, 'life1, 'async_trait>( &'life0 self, path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<Vec<u8>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Read entire file contents as bytes.

fn read_to_string<'life0, 'life1, 'async_trait>( &'life0 self, path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<String>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Read file contents as UTF-8 string.

fn write<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, path: &'life1 str, contents: &'life2 [u8], ) -> Pin<Box<dyn Future<Output = VfsResult<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Write bytes to file (atomic on native, best-effort on WASM).

fn append<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, path: &'life1 str, contents: &'life2 [u8], ) -> Pin<Box<dyn Future<Output = VfsResult<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Append bytes to file (atomic append semantics).

fn exists<'life0, 'life1, 'async_trait>( &'life0 self, path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<bool>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Check if file exists.

fn remove<'life0, 'life1, 'async_trait>( &'life0 self, path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Delete a file.

fn create_dir_all<'life0, 'life1, 'async_trait>( &'life0 self, _path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Create directory and all parent directories.

fn rename<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, from: &'life1 str, to: &'life2 str, ) -> Pin<Box<dyn Future<Output = VfsResult<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Atomically rename a file (for journal compaction).

fn list_dir<'life0, 'life1, 'async_trait>( &'life0 self, path: &'life1 str, ) -> Pin<Box<dyn Future<Output = VfsResult<Vec<DirEntry>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

List entries in a directory.