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Fix op-assignment overrides.

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This commit is contained in:
Stephen Chung
2020-09-21 16:15:52 +08:00
parent 748d4d2f36
commit 83f9df2852
6 changed files with 61 additions and 32 deletions
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8
doc/src/rust/custom.md
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@@ -161,13 +161,15 @@ x.type_of() == "Hello";
Use the Custom Type With Arrays
------------------------------
The `push` and `pad` functions for [arrays] are only defined for standard built-in types.
For custom types, type-specific versions must be registered:
The `push` and `pad` functions, as well as the `+=` operator, for [arrays] are only defined for
standard built-in types. For custom types, type-specific versions must be registered:
```rust
engine
.register_fn("push", |list: &mut Array, item: TestStruct| {
list.push(Dynamic::from(item));
}).register_fn("+=", |list: &mut Array, item: TestStruct| {
list.push(Dynamic::from(item));
}).register_fn("pad", |list: &mut Array, len: i64, item: TestStruct| {
if len as usize > list.len() {
list.resize(len as usize, item);
@@ -176,7 +178,7 @@ engine
```
In particular, in order to use the `in` operator with a custom type for an [array],
the `==` operator must be registered for that custom type:
the `==` operator must be registered for the custom type:
```rust
// Assume 'TestStruct' implements `PartialEq`