[−][src]Trait proc_macro_roids::DeriveInputExt
Functions to make it ergonomic to work with struct
ASTs.
Required methods
fn append_derives(&mut self, derives: Punctuated<NestedMeta, Comma>)
Appends derives to the list of derives.
Note: This can only be used with attribute macros, and not derive macros.
- If the
derive
attribute does not exist, one will be created. - If the
derive
attribute exists, and there are existingderive
s that overlap with the derives to append, this macro will panic with the overlapping derives. - If the
derive
attribute exists, and there are no overlappingderive
s, then they will be combined.
Panics
Panics if there are existing derive
s that overlap with the derives to append.
fn tag_parameter(&self, namespace: &Path, tag: &Path) -> Option<Meta>
Returns the parameter from #[namespace(tag(parameter))]
.
Parameters
namespace
: Thepath()
of the first-level attribute.tag
: Thepath()
of the second-level attribute.
Panics
Panics if there is more than one parameter for the tag.
fn tag_parameters(&self, namespace: &Path, tag: &Path) -> Vec<Meta>
Returns the parameters from #[namespace(tag(param1, param2, ..))]
.
Parameters
namespace
: Thepath()
of the first-level attribute.tag
: Thepath()
of the second-level attribute.