Struct bevy::ecs::query::QueryBuilder

pub struct QueryBuilder<'w, D = (), F = ()>
where D: QueryData, F: QueryFilter,
{ /* private fields */ }
Expand description

Builder struct to create QueryState instances at runtime.

let mut world = World::new();
let entity_a = world.spawn((A, B)).id();
let entity_b = world.spawn((A, C)).id();

// Instantiate the builder using the type signature of the iterator you will consume
let mut query = QueryBuilder::<(Entity, &B)>::new(&mut world)
// Add additional terms through builder methods
    .with::<A>()
    .without::<C>()
    .build();

// Consume the QueryState
let (entity, b) = query.single(&world);

Implementations§

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impl<'w, D, F> QueryBuilder<'w, D, F>
where D: QueryData, F: QueryFilter,

pub fn new(world: &'w mut World) -> QueryBuilder<'w, D, F>

Creates a new builder with the accesses required for Q and F

Examples found in repository?
examples/ecs/dynamic.rs (line 148)
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fn main() {
    let mut world = World::new();
    let mut lines = std::io::stdin().lines();
    let mut component_names = HashMap::<String, ComponentId>::new();
    let mut component_info = HashMap::<ComponentId, ComponentInfo>::new();

    println!("{}", PROMPT);
    loop {
        print!("\n> ");
        let _ = std::io::stdout().flush();
        let Some(Ok(line)) = lines.next() else {
            return;
        };

        if line.is_empty() {
            return;
        };

        let Some((first, rest)) = line.trim().split_once(|c: char| c.is_whitespace()) else {
            match &line.chars().next() {
                Some('c') => println!("{}", COMPONENT_PROMPT),
                Some('s') => println!("{}", ENTITY_PROMPT),
                Some('q') => println!("{}", QUERY_PROMPT),
                _ => println!("{}", PROMPT),
            }
            continue;
        };

        match &first[0..1] {
            "c" => {
                rest.split(',').for_each(|component| {
                    let mut component = component.split_whitespace();
                    let Some(name) = component.next() else {
                        return;
                    };
                    let size = match component.next().map(|s| s.parse::<usize>()) {
                        Some(Ok(size)) => size,
                        _ => 0,
                    };
                    // Register our new component to the world with a layout specified by it's size
                    // SAFETY: [u64] is Send + Sync
                    let id = world.init_component_with_descriptor(unsafe {
                        ComponentDescriptor::new_with_layout(
                            name.to_string(),
                            StorageType::Table,
                            Layout::array::<u64>(size).unwrap(),
                            None,
                        )
                    });
                    let Some(info) = world.components().get_info(id) else {
                        return;
                    };
                    component_names.insert(name.to_string(), id);
                    component_info.insert(id, info.clone());
                    println!("Component {} created with id: {:?}", name, id.index());
                });
            }
            "s" => {
                let mut to_insert_ids = Vec::new();
                let mut to_insert_data = Vec::new();
                rest.split(',').for_each(|component| {
                    let mut component = component.split_whitespace();
                    let Some(name) = component.next() else {
                        return;
                    };

                    // Get the id for the component with the given name
                    let Some(&id) = component_names.get(name) else {
                        println!("Component {} does not exist", name);
                        return;
                    };

                    // Calculate the length for the array based on the layout created for this component id
                    let info = world.components().get_info(id).unwrap();
                    let len = info.layout().size() / std::mem::size_of::<u64>();
                    let mut values: Vec<u64> = component
                        .take(len)
                        .filter_map(|value| value.parse::<u64>().ok())
                        .collect();
                    values.resize(len, 0);

                    // Collect the id and array to be inserted onto our entity
                    to_insert_ids.push(id);
                    to_insert_data.push(values);
                });

                let mut entity = world.spawn_empty();

                // Construct an `OwningPtr` for each component in `to_insert_data`
                let to_insert_ptr = to_owning_ptrs(&mut to_insert_data);

                // SAFETY:
                // - Component ids have been taken from the same world
                // - Each array is created to the layout specified in the world
                unsafe {
                    entity.insert_by_ids(&to_insert_ids, to_insert_ptr.into_iter());
                }

                println!("Entity spawned with id: {:?}", entity.id());
            }
            "q" => {
                let mut builder = QueryBuilder::<FilteredEntityMut>::new(&mut world);
                parse_query(rest, &mut builder, &component_names);
                let mut query = builder.build();

                query.iter_mut(&mut world).for_each(|filtered_entity| {
                    let terms = filtered_entity
                        .components()
                        .map(|id| {
                            let ptr = filtered_entity.get_by_id(id).unwrap();
                            let info = component_info.get(&id).unwrap();
                            let len = info.layout().size() / std::mem::size_of::<u64>();

                            // SAFETY:
                            // - All components are created with layout [u64]
                            // - len is calculated from the component descriptor
                            let data = unsafe {
                                std::slice::from_raw_parts_mut(
                                    ptr.assert_unique().as_ptr().cast::<u64>(),
                                    len,
                                )
                            };

                            // If we have write access, increment each value once
                            if filtered_entity.access().has_write(id) {
                                data.iter_mut().for_each(|data| {
                                    *data += 1;
                                });
                            }

                            format!("{}: {:?}", info.name(), data[0..len].to_vec())
                        })
                        .collect::<Vec<_>>()
                        .join(", ");

                    println!("{:?}: {}", filtered_entity.id(), terms);
                });
            }
            _ => continue,
        }
    }
}

pub fn world(&self) -> &World

Returns a reference to the world passed to Self::new.

pub fn world_mut(&mut self) -> &mut World

Returns a mutable reference to the world passed to Self::new.

pub fn extend_access(&mut self, access: FilteredAccess<ComponentId>)

Adds access to self’s underlying FilteredAccess respecting Self::or and Self::and

pub fn data<T>(&mut self) -> &mut QueryBuilder<'w, D, F>
where T: QueryData,

Adds accesses required for T to self.

pub fn filter<T>(&mut self) -> &mut QueryBuilder<'w, D, F>
where T: QueryFilter,

Adds filter from T to self.

pub fn with<T>(&mut self) -> &mut QueryBuilder<'w, D, F>
where T: Component,

Adds With<T> to the FilteredAccess of self.

pub fn with_id(&mut self, id: ComponentId) -> &mut QueryBuilder<'w, D, F>

Adds With<T> to the FilteredAccess of self from a runtime ComponentId.

Examples found in repository?
examples/ecs/dynamic.rs (line 240)
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fn parse_term<Q: QueryData>(
    str: &str,
    builder: &mut QueryBuilder<Q>,
    components: &HashMap<String, ComponentId>,
) {
    let mut matched = false;
    let str = str.trim();
    match str.chars().next() {
        // Optional term
        Some('?') => {
            builder.optional(|b| parse_term(&str[1..], b, components));
            matched = true;
        }
        // Reference term
        Some('&') => {
            let mut parts = str.split_whitespace();
            let first = parts.next().unwrap();
            if first == "&mut" {
                if let Some(str) = parts.next() {
                    if let Some(&id) = components.get(str) {
                        builder.mut_id(id);
                        matched = true;
                    }
                };
            } else if let Some(&id) = components.get(&first[1..]) {
                builder.ref_id(id);
                matched = true;
            }
        }
        // With term
        Some(_) => {
            if let Some(&id) = components.get(str) {
                builder.with_id(id);
                matched = true;
            }
        }
        None => {}
    };

    if !matched {
        println!("Unable to find component: {}", str);
    }
}

pub fn without<T>(&mut self) -> &mut QueryBuilder<'w, D, F>
where T: Component,

Adds Without<T> to the FilteredAccess of self.

pub fn without_id(&mut self, id: ComponentId) -> &mut QueryBuilder<'w, D, F>

Adds Without<T> to the FilteredAccess of self from a runtime ComponentId.

pub fn ref_id(&mut self, id: ComponentId) -> &mut QueryBuilder<'w, D, F>

Adds &T to the FilteredAccess of self.

Examples found in repository?
examples/ecs/dynamic.rs (line 233)
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fn parse_term<Q: QueryData>(
    str: &str,
    builder: &mut QueryBuilder<Q>,
    components: &HashMap<String, ComponentId>,
) {
    let mut matched = false;
    let str = str.trim();
    match str.chars().next() {
        // Optional term
        Some('?') => {
            builder.optional(|b| parse_term(&str[1..], b, components));
            matched = true;
        }
        // Reference term
        Some('&') => {
            let mut parts = str.split_whitespace();
            let first = parts.next().unwrap();
            if first == "&mut" {
                if let Some(str) = parts.next() {
                    if let Some(&id) = components.get(str) {
                        builder.mut_id(id);
                        matched = true;
                    }
                };
            } else if let Some(&id) = components.get(&first[1..]) {
                builder.ref_id(id);
                matched = true;
            }
        }
        // With term
        Some(_) => {
            if let Some(&id) = components.get(str) {
                builder.with_id(id);
                matched = true;
            }
        }
        None => {}
    };

    if !matched {
        println!("Unable to find component: {}", str);
    }
}

pub fn mut_id(&mut self, id: ComponentId) -> &mut QueryBuilder<'w, D, F>

Adds &mut T to the FilteredAccess of self.

Examples found in repository?
examples/ecs/dynamic.rs (line 228)
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fn parse_term<Q: QueryData>(
    str: &str,
    builder: &mut QueryBuilder<Q>,
    components: &HashMap<String, ComponentId>,
) {
    let mut matched = false;
    let str = str.trim();
    match str.chars().next() {
        // Optional term
        Some('?') => {
            builder.optional(|b| parse_term(&str[1..], b, components));
            matched = true;
        }
        // Reference term
        Some('&') => {
            let mut parts = str.split_whitespace();
            let first = parts.next().unwrap();
            if first == "&mut" {
                if let Some(str) = parts.next() {
                    if let Some(&id) = components.get(str) {
                        builder.mut_id(id);
                        matched = true;
                    }
                };
            } else if let Some(&id) = components.get(&first[1..]) {
                builder.ref_id(id);
                matched = true;
            }
        }
        // With term
        Some(_) => {
            if let Some(&id) = components.get(str) {
                builder.with_id(id);
                matched = true;
            }
        }
        None => {}
    };

    if !matched {
        println!("Unable to find component: {}", str);
    }
}

pub fn optional( &mut self, f: impl Fn(&mut QueryBuilder<'_>), ) -> &mut QueryBuilder<'w, D, F>

Takes a function over mutable access to a QueryBuilder, calls that function on an empty builder and then adds all accesses from that builder to self as optional.

Examples found in repository?
examples/ecs/dynamic.rs (line 218)
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fn parse_term<Q: QueryData>(
    str: &str,
    builder: &mut QueryBuilder<Q>,
    components: &HashMap<String, ComponentId>,
) {
    let mut matched = false;
    let str = str.trim();
    match str.chars().next() {
        // Optional term
        Some('?') => {
            builder.optional(|b| parse_term(&str[1..], b, components));
            matched = true;
        }
        // Reference term
        Some('&') => {
            let mut parts = str.split_whitespace();
            let first = parts.next().unwrap();
            if first == "&mut" {
                if let Some(str) = parts.next() {
                    if let Some(&id) = components.get(str) {
                        builder.mut_id(id);
                        matched = true;
                    }
                };
            } else if let Some(&id) = components.get(&first[1..]) {
                builder.ref_id(id);
                matched = true;
            }
        }
        // With term
        Some(_) => {
            if let Some(&id) = components.get(str) {
                builder.with_id(id);
                matched = true;
            }
        }
        None => {}
    };

    if !matched {
        println!("Unable to find component: {}", str);
    }
}

pub fn and( &mut self, f: impl Fn(&mut QueryBuilder<'_>), ) -> &mut QueryBuilder<'w, D, F>

Takes a function over mutable access to a QueryBuilder, calls that function on an empty builder and then adds all accesses from that builder to self.

Primarily used when inside a Self::or closure to group several terms.

pub fn or( &mut self, f: impl Fn(&mut QueryBuilder<'_>), ) -> &mut QueryBuilder<'w, D, F>

Takes a function over mutable access to a QueryBuilder, calls that function on an empty builder, all accesses added to that builder will become terms in an or expression.

QueryBuilder::<Entity>::new(&mut world).or(|builder| {
    builder.with::<A>();
    builder.with::<B>();
});
// is equivalent to
QueryBuilder::<Entity>::new(&mut world).filter::<Or<(With<A>, With<B>)>>();
Examples found in repository?
examples/ecs/dynamic.rs (lines 263-267)
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fn parse_query<Q: QueryData>(
    str: &str,
    builder: &mut QueryBuilder<Q>,
    components: &HashMap<String, ComponentId>,
) {
    let str = str.split(',');
    str.for_each(|term| {
        let sub_terms: Vec<_> = term.split("||").collect();
        if sub_terms.len() == 1 {
            parse_term(sub_terms[0], builder, components);
        } else {
            builder.or(|b| {
                sub_terms
                    .iter()
                    .for_each(|term| parse_term(term, b, components));
            });
        }
    });
}

pub fn access(&self) -> &FilteredAccess<ComponentId>

Returns a reference to the FilteredAccess that will be provided to the built Query.

pub fn transmute<NewD>(&mut self) -> &mut QueryBuilder<'w, NewD>
where NewD: QueryData,

Transmute the existing builder adding required accesses. This will maintain all existing accesses.

If including a filter type see Self::transmute_filtered

pub fn transmute_filtered<NewD, NewF>( &mut self, ) -> &mut QueryBuilder<'w, NewD, NewF>
where NewD: QueryData, NewF: QueryFilter,

Transmute the existing builder adding required accesses. This will maintain all existing accesses.

pub fn build(&mut self) -> QueryState<D, F>

Create a QueryState with the accesses of the builder.

Takes &mut self to access the innner world reference while initializing state for the new QueryState

Examples found in repository?
examples/ecs/dynamic.rs (line 150)
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fn main() {
    let mut world = World::new();
    let mut lines = std::io::stdin().lines();
    let mut component_names = HashMap::<String, ComponentId>::new();
    let mut component_info = HashMap::<ComponentId, ComponentInfo>::new();

    println!("{}", PROMPT);
    loop {
        print!("\n> ");
        let _ = std::io::stdout().flush();
        let Some(Ok(line)) = lines.next() else {
            return;
        };

        if line.is_empty() {
            return;
        };

        let Some((first, rest)) = line.trim().split_once(|c: char| c.is_whitespace()) else {
            match &line.chars().next() {
                Some('c') => println!("{}", COMPONENT_PROMPT),
                Some('s') => println!("{}", ENTITY_PROMPT),
                Some('q') => println!("{}", QUERY_PROMPT),
                _ => println!("{}", PROMPT),
            }
            continue;
        };

        match &first[0..1] {
            "c" => {
                rest.split(',').for_each(|component| {
                    let mut component = component.split_whitespace();
                    let Some(name) = component.next() else {
                        return;
                    };
                    let size = match component.next().map(|s| s.parse::<usize>()) {
                        Some(Ok(size)) => size,
                        _ => 0,
                    };
                    // Register our new component to the world with a layout specified by it's size
                    // SAFETY: [u64] is Send + Sync
                    let id = world.init_component_with_descriptor(unsafe {
                        ComponentDescriptor::new_with_layout(
                            name.to_string(),
                            StorageType::Table,
                            Layout::array::<u64>(size).unwrap(),
                            None,
                        )
                    });
                    let Some(info) = world.components().get_info(id) else {
                        return;
                    };
                    component_names.insert(name.to_string(), id);
                    component_info.insert(id, info.clone());
                    println!("Component {} created with id: {:?}", name, id.index());
                });
            }
            "s" => {
                let mut to_insert_ids = Vec::new();
                let mut to_insert_data = Vec::new();
                rest.split(',').for_each(|component| {
                    let mut component = component.split_whitespace();
                    let Some(name) = component.next() else {
                        return;
                    };

                    // Get the id for the component with the given name
                    let Some(&id) = component_names.get(name) else {
                        println!("Component {} does not exist", name);
                        return;
                    };

                    // Calculate the length for the array based on the layout created for this component id
                    let info = world.components().get_info(id).unwrap();
                    let len = info.layout().size() / std::mem::size_of::<u64>();
                    let mut values: Vec<u64> = component
                        .take(len)
                        .filter_map(|value| value.parse::<u64>().ok())
                        .collect();
                    values.resize(len, 0);

                    // Collect the id and array to be inserted onto our entity
                    to_insert_ids.push(id);
                    to_insert_data.push(values);
                });

                let mut entity = world.spawn_empty();

                // Construct an `OwningPtr` for each component in `to_insert_data`
                let to_insert_ptr = to_owning_ptrs(&mut to_insert_data);

                // SAFETY:
                // - Component ids have been taken from the same world
                // - Each array is created to the layout specified in the world
                unsafe {
                    entity.insert_by_ids(&to_insert_ids, to_insert_ptr.into_iter());
                }

                println!("Entity spawned with id: {:?}", entity.id());
            }
            "q" => {
                let mut builder = QueryBuilder::<FilteredEntityMut>::new(&mut world);
                parse_query(rest, &mut builder, &component_names);
                let mut query = builder.build();

                query.iter_mut(&mut world).for_each(|filtered_entity| {
                    let terms = filtered_entity
                        .components()
                        .map(|id| {
                            let ptr = filtered_entity.get_by_id(id).unwrap();
                            let info = component_info.get(&id).unwrap();
                            let len = info.layout().size() / std::mem::size_of::<u64>();

                            // SAFETY:
                            // - All components are created with layout [u64]
                            // - len is calculated from the component descriptor
                            let data = unsafe {
                                std::slice::from_raw_parts_mut(
                                    ptr.assert_unique().as_ptr().cast::<u64>(),
                                    len,
                                )
                            };

                            // If we have write access, increment each value once
                            if filtered_entity.access().has_write(id) {
                                data.iter_mut().for_each(|data| {
                                    *data += 1;
                                });
                            }

                            format!("{}: {:?}", info.name(), data[0..len].to_vec())
                        })
                        .collect::<Vec<_>>()
                        .join(", ");

                    println!("{:?}: {}", filtered_entity.id(), terms);
                });
            }
            _ => continue,
        }
    }
}

Trait Implementations§

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impl<D, F> From<QueryBuilder<'_, D, F>> for QueryState<D, F>
where D: QueryData, F: QueryFilter,

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fn from(value: QueryBuilder<'_, D, F>) -> QueryState<D, F>

Converts to this type from the input type.

Auto Trait Implementations§

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impl<'w, D, F> Freeze for QueryBuilder<'w, D, F>

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impl<'w, D = (), F = ()> !RefUnwindSafe for QueryBuilder<'w, D, F>

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impl<'w, D, F> Send for QueryBuilder<'w, D, F>
where D: Send, F: Send,

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impl<'w, D, F> Sync for QueryBuilder<'w, D, F>
where D: Sync, F: Sync,

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impl<'w, D, F> Unpin for QueryBuilder<'w, D, F>
where D: Unpin, F: Unpin,

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impl<'w, D = (), F = ()> !UnwindSafe for QueryBuilder<'w, D, F>

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<F, T> IntoSample<T> for F
where T: FromSample<F>,

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fn into_sample(self) -> T

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> ToSample<U> for T
where U: FromSample<T>,

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fn to_sample_(self) -> U

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Upcast<T> for T

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fn upcast(&self) -> Option<&T>

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ConditionalSend for T
where T: Send,

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impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

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impl<T> Settings for T
where T: 'static + Send + Sync,

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impl<T> WasmNotSend for T
where T: Send,

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impl<T> WasmNotSendSync for T
where T: WasmNotSend + WasmNotSync,

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impl<T> WasmNotSync for T
where T: Sync,