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49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
# Rusty Value
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[](https://crates.io/crates/rusty-value)
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[](https://docs.rs/rusty-value/)
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This crate adds a `RustyValue` trait that can be derived for all types (except unions)
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to create a generic value that represents a rust value.
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This can be used to implement serialization of types without having to rely on serde.
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## Usage
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The trait `RustyValue` allows one to create a `rusty_value::Value` for any
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type that implements it. This trait can be derived if the `derive` **feature** is enabled.
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```rust
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use rusty_value::*;
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#[derive(RustyValue)]
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struct MyStruct {
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foo: String,
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bar: u8,
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}
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fn main() {
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let value = MyStruct {
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foo: "Hello World".to_string(),
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bar: 12,
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}.into_rusty_value();
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match value {
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Value::Primitive(p) => match p {
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rusty_value::Primitive::Integer(_) => println!("is an integer"),
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rusty_value::Primitive::Float(_) => println!("is a float"),
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rusty_value::Primitive::String(_) => println!("is a string"),
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rusty_value::Primitive::OsString(_) => println!("is a os string"),
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rusty_value::Primitive::Char(_) => println!("is a char"),
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rusty_value::Primitive::Bool(_) => println!("is a boolean"),
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},
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Value::Struct(s) => println!("is a struct with name {}", s.name),
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Value::Enum(e) => println!("is an enum with name {} of variant {}", e.name, e.variant),
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Value::Map(_) => println!("is a map"),
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Value::List(_) => println!("is a list"),
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Value::None => println!("is none"),
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}
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}
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```
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Converting a type into a rusty value cannot fail as `rusty_value::RustyValue` is
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able to represent any safe rust data type. The trait `RustyValue` is already implemented for
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most std types and can therefore be easily derived. |