struct CastTemplate(Box<dyn Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>> + Send + Sync>);Expand description
A cast template is a function that produces a Cast given a concrete input
and output type. A template can return None to indicate that it is
incapable of producing a cast for the specified types.
Cast templates are used to share code for similar casts, where the input or output type is of one “category” of type. For example, a single cast template handles converting from strings to any list type. Without cast templates, we’d have to enumerate every possible list -> list conversion, which is impractical.
Tuple Fields§
§0: Box<dyn Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>> + Send + Sync>Implementations§
Source§impl CastTemplate
impl CastTemplate
fn new<T, C>(t: T) -> CastTemplatewhere
T: Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<C> + Send + Sync + 'static,
C: FnOnce(HirScalarExpr) -> HirScalarExpr + 'static,
Trait Implementations§
Source§impl From<UnaryFunc> for CastTemplate
impl From<UnaryFunc> for CastTemplate
Source§fn from(u: UnaryFunc) -> CastTemplate
fn from(u: UnaryFunc) -> CastTemplate
Converts to this type from the input type.
Auto Trait Implementations§
impl Freeze for CastTemplate
impl !RefUnwindSafe for CastTemplate
impl Send for CastTemplate
impl Sync for CastTemplate
impl Unpin for CastTemplate
impl !UnwindSafe for CastTemplate
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