Struct rhai::plugin::Dynamic[−][src]

Constant Dynamic values are read-only. If a &mut Dynamic to such a constant is passed to a Rust function, the function can use this information to return an error of EvalAltResult::ErrorAssignmentToConstant if its value is going to be modified. This safe-guards constant values from being modified from within Rust functions.

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pub fn from<T: Variant + Clone>(value: T) -> Self

Create a Dynamic from any type. A Dynamic value is simply returned as is.

Safety

This type uses some unsafe code, mainly for type casting.

Notes

Beware that you need to pass in an Array type for it to be recognized as an Array. A Vec<T> does not get automatically converted to an Array, but will be a generic restricted trait object instead, because Vec<T> is not a supported standard type.

Similarly, passing in a HashMap<String, T> will not get a Map but a trait object.

Examples

use rhai::Dynamic;

let result = Dynamic::from(42_i64);
assert_eq!(result.type_name(), "i64");
assert_eq!(result.to_string(), "42");

let result = Dynamic::from("hello");
assert_eq!(result.type_name(), "string");
assert_eq!(result.to_string(), "hello");

let new_result = Dynamic::from(result);
assert_eq!(new_result.type_name(), "string");
assert_eq!(new_result.to_string(), "hello");

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pub fn into_shared(self) -> Self

Turn the Dynamic value into a shared Dynamic value backed by an Rc<RefCell<Dynamic>> or Arc<RwLock<Dynamic>> depending on the sync feature.

Shared Dynamic values are relatively cheap to clone as they simply increment the reference counts.

Shared Dynamic values can be converted seamlessly to and from ordinary Dynamic values.

If the Dynamic value is already shared, this method returns itself.

Panics

Panics under the no_closure feature.

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pub fn try_cast<T: Variant>(self) -> Option<T>

Convert the Dynamic value into specific type.

Casting to a Dynamic just returns as is, but if it contains a shared value, it is cloned into a Dynamic with a normal value.

Returns None if types mismatched.

Panics or Deadlocks

Under the sync feature, this call may deadlock, or panic. Otherwise, this call panics if the data is currently borrowed for write.

These normally shouldn’t occur since most operations in Rhai is single-threaded.

Example

use rhai::Dynamic;

let x = Dynamic::from(42_u32);

assert_eq!(x.try_cast::<u32>().unwrap(), 42);

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pub fn cast<T: Variant + Clone>(self) -> T

Convert the Dynamic value into a specific type.

Casting to a Dynamic just returns as is, but if it contains a shared value, it is cloned into a Dynamic with a normal value.

Returns None if types mismatched.

Panics or Deadlocks

Panics if the cast fails (e.g. the type of the actual value is not the same as the specified type).

Under the sync feature, this call may deadlock, or panic. Otherwise, this call panics if the data is currently borrowed for write.

These normally shouldn’t occur since most operations in Rhai is single-threaded.

Example

use rhai::Dynamic;

let x = Dynamic::from(42_u32);

assert_eq!(x.cast::<u32>(), 42);

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pub fn flatten_clone(&self) -> Self

Flatten the Dynamic and clone it.

If the Dynamic is not a shared value, it returns a cloned copy.

If the Dynamic is a shared value, it a cloned copy of the shared value.

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pub fn flatten(self) -> Self

Flatten the Dynamic.

If the Dynamic is not a shared value, it returns itself.

If the Dynamic is a shared value, it returns the shared value if there are no outstanding references, or a cloned copy.

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pub fn is_locked(&self) -> bool

Is the Dynamic a shared value that is locked?

Note

Under the sync feature, shared values use RwLock and they are never locked. Access just waits until the RwLock is released. So this method always returns false under Sync.

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pub fn read_lock<T: Variant + Clone>(&self) -> Option<DynamicReadLock<'_, T>>

Get a reference of a specific type to the Dynamic. Casting to Dynamic just returns a reference to it.

Returns None if the cast fails.

Panics or Deadlocks When Value is Shared

Under the sync feature, this call may deadlock, or panic. Otherwise, this call panics if the data is currently borrowed for write.

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pub fn write_lock<T: Variant + Clone>(
&mut self
) -> Option<DynamicWriteLock<'_, T>>

Get a mutable reference of a specific type to the Dynamic. Casting to Dynamic just returns a mutable reference to it.

Returns None if the cast fails.

Panics or Deadlocks When Value is Shared

Under the sync feature, this call may deadlock, or panic. Otherwise, this call panics if the data is currently borrowed for write.

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pub fn as_int(&self) -> Result<INT, &'static str>

Cast the Dynamic as the system integer type INT and return it. Returns the name of the actual type if the cast fails.

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pub fn as_float(&self) -> Result<FLOAT, &'static str>

Cast the Dynamic as the system floating-point type FLOAT and return it. Returns the name of the actual type if the cast fails.

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pub fn as_bool(&self) -> Result<bool, &'static str>

Cast the Dynamic as a bool and return it. Returns the name of the actual type if the cast fails.

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pub fn as_char(&self) -> Result<char, &'static str>

Cast the Dynamic as a char and return it. Returns the name of the actual type if the cast fails.

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pub fn as_str(&self) -> Result<&str, &'static str>

Cast the Dynamic as a String and return the string slice. Returns the name of the actual type if the cast fails.

Cast is failing if self is Shared Dynamic

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pub fn take_string(self) -> Result<String, &'static str>

Convert the Dynamic into a String and return it. If there are other references to the same string, a cloned copy is returned. Returns the name of the actual type if the cast fails.

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