default-constructor
Macros for creating pseudo-dsls that constructs structs through default construction and field conversion.
Motivation
This crates is primary designed for bevy
where constructing large bundles
with ..Default::default()
is common.
Syntax
Take construct!
that uses Into
.
construct!
This expands to
Student
The macro is recursive on nested struct declarations, if the behavior is not desired, wrap nested structs in brackets.
construct!
Tuple Construction
To create a tuple, concatenate multiple structs with comma.
construct!
Meta Constructor
The meta constructor macro allows you to define your own macro with custom configurations.
See documentation on meta_default_constructor!
for details.
InferInto
InferInto allows the user to bypass the orphan rule to create conversions.
By default we provide i32
(integer literal) to all numeric types
and i64
-> f64
in addition to the standard From
and Into
.
If multiple conversion paths are found, the conversion will fail,
thus failing the infer_construct
macro.
ChangeLog
-
0.4
meta_default_constructor
no longer takes a list of imports as the first argument.meta_default_constructor
can now create tuples by chaining with comma.
-
0.5
Made changes to fit
bevy 0.15
's patterns.- No longer treats
Ident
asIdent::default()
. - No longer treats snake case functions as structs.
- All non-struct patterns falls through the macro.
- No longer treats
License
License under either of
Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.
Contribution
Contributions are welcome!
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.