# Struct http_body::SizeHint [−] [src]

    pub struct SizeHint { /* fields omitted */ }

A `Body` size hint

The default implementation returns:

- 0 for `lower`
- `None` for `upper`.

## Implementations

### `impl SizeHint` [src]

#### `pub fn new() -> SizeHint` [src]

Returns a new `SizeHint` with default values

#### `pub fn with_exact(value: u64) -> SizeHint` [src]

Returns a new `SizeHint` with both upper and lower bounds set to the given value.

#### `pub fn lower(&self) -> u64` [src]

Returns the lower bound of data that the `Body` will yield before completing.

#### `pub fn set_lower(&mut self, value: u64)` [src]

Set the value of the `lower` hint.

# Panics

The function panics if `value` is greater than `upper`.

#### `pub fn upper(&self) -> Option<u64>` [src]

Returns the upper bound of data the `Body` will yield before completing, or `None` if the value is unknown.

#### `pub fn set_upper(&mut self, value: u64)` [src]

Set the value of the `upper` hint value.

# Panics

This function panics if `value` is less than `lower`.

#### `pub fn exact(&self) -> Option<u64>` [src]

Returns the exact size of data that will be yielded if the `lower` and `upper` bounds are equal.

#### `pub fn set_exact(&mut self, value: u64)` [src]

Set the value of the `lower` and `upper` bounds to exactly the same.

## Trait Implementations

### `impl Clone for SizeHint` [src]

#### `fn clone(&self) -> SizeHint` [src]

Returns a copy of the value. Read more

#### `pub fn clone_from(&mut self, source: &Self)`1.0.0 [src]

Performs copy-assignment from `source`. Read more

### `impl Debug for SizeHint` [src]

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

### `impl Default for SizeHint` [src]

#### `fn default() -> SizeHint` [src]

Returns the “default value” for a type. Read more

## Auto Trait Implementations

### `impl RefUnwindSafe for SizeHint`

### `impl Send for SizeHint`

### `impl Sync for SizeHint`

### `impl Unpin for SizeHint`

### `impl UnwindSafe for SizeHint`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `pub fn to_owned(&self) -> T` [src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `pub fn clone_into(&self, target: &mut T)` [src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into`)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.