16 lines
614 B
Rust
16 lines
614 B
Rust
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use serde::Serialize;
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use serde_json::Value;
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/// Extract the variant tag of any enum that uses Serde.
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#[allow(dead_code)]
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pub fn variant_name<T: Serialize>(v: &T) -> String {
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// 1. Serialize to JSON Value.
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match serde_json::to_value(v).unwrap() {
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// internally-tagged: {"type": "Foo", ...}
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Value::Object(ref map) if map.get("type").is_some() => map["type"].as_str().unwrap().to_string(),
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// externally-tagged: {"Foo": {...}}
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Value::Object(map) => map.keys().next().unwrap().as_str().to_string(),
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_ => panic!("untagged enum or unsupported representation"),
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}
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}
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