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Bindings: Add convenience method for requiring an attribute

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Eelco Dolstra 2019-05-31 23:44:42 +02:00
parent a2f86ac647
commit fb692e5f7b
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1 changed files with 8 additions and 0 deletions
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8
src/libexpr/attr-set.hh
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@ -72,6 +72,14 @@ public:
return {}; return {};
} }
Attr & need(const Symbol & name, const Pos & pos = noPos)
{
auto a = get(name);
if (!a)
throw Error("attribute '%s' missing, at %s", name, pos);
return **a;
}
iterator begin() { return &attrs[0]; } iterator begin() { return &attrs[0]; }
iterator end() { return &attrs[size_]; } iterator end() { return &attrs[size_]; }