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Move some concat functions to builtin.

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This commit is contained in:
Stephen Chung
2020-10-10 22:13:55 +08:00
parent 836b4de925
commit 994e5a4251
4 changed files with 60 additions and 29 deletions
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16
doc/src/rust/print-custom.md
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@@ -7,11 +7,11 @@ To use custom types for [`print`] and [`debug`], or convert its value into a [st
it is necessary that the following functions be registered (assuming the custom type
is `T : Display + Debug`):
| Function | Signature | Typical implementation | Usage |
| ----------- | ------------------------------------------------------------- | ------------------------------------- | ---------------------------------------------------------------------------------------- |
| `to_string` | <code>\|s: &mut T\| -> ImmutableString</code> | `s.to_string().into()` | converts the custom type into a [string] |
| `print` | <code>\|s: &mut T\| -> ImmutableString</code> | `s.to_string().into()` | converts the custom type into a [string] for the [`print`] statement |
| `debug` | <code>\|s: &mut T\| -> ImmutableString</code> | `format!("{:?}", s).into()` | converts the custom type into a [string] for the [`debug`] statement |
| `+` | <code>\|s1: ImmutableString, s: T\| -> ImmutableString</code> | `s1 + s` | appends the custom type to another [string], for `print("Answer: " + type);` usage |
| `+` | <code>\|s: T, s2: ImmutableString\| -> ImmutableString</code> | `s.to_string().push_str(&s2).into();` | appends another [string] to the custom type, for `print(type + " is the answer");` usage |
| `+=` | <code>\|s1: &mut ImmutableString, s: T\|</code> | `s1 += s.to_string()` | appends the custom type to an existing [string], for `s += type;` usage |
| Function | Signature | Typical implementation | Usage |
| ----------- | ---------------------------------------------- | ---------------------------- | -------------------------------------------------------------------- |
| `to_string` | <code>\|x: &mut T\| -> String</code> | `x.to_string()` | converts the custom type into a [string] |
| `print` | <code>\|x: &mut T\| -> String</code> | `x.to_string()` | converts the custom type into a [string] for the [`print`] statement |
| `debug` | <code>\|x: &mut T\| -> String</code> | `format!("{:?}", x)` | converts the custom type into a [string] for the [`debug`] statement |
| `+` | <code>\|s: &str, x: T\| -> String</code> | `format!("{}{}", s, x)` | concatenates the custom type with another [string] |
| `+` | <code>\|x: &mut T, s: &str\| -> String</code> | `x.to_string().push_str(s);` | concatenates another [string] with the custom type |
| `+=` | <code>\|s: &mut ImmutableString, x: T\|</code> | `s += x.to_string()` | appends the custom type to an existing [string] |