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-rw-r--r--libbuild2/variable.txx83
1 files changed, 80 insertions, 3 deletions
diff --git a/libbuild2/variable.txx b/libbuild2/variable.txx
index 501e103..9d39ed7 100644
--- a/libbuild2/variable.txx
+++ b/libbuild2/variable.txx
@@ -629,6 +629,68 @@ namespace build2
return 0;
}
+ // Provide subscript for vector<T> for efficiency.
+ //
+ template <typename T>
+ value
+ vector_subscript (const value& val, value* val_data,
+ value&& sub,
+ const location& sloc,
+ const location& bloc)
+ {
+ // Process subscript even if the value is null to make sure it is valid.
+ //
+ size_t i;
+ try
+ {
+ i = static_cast<size_t> (convert<uint64_t> (move (sub)));
+ }
+ catch (const invalid_argument& e)
+ {
+ fail (sloc) << "invalid " << value_traits<vector<T>>::value_type.name
+ << " value subscript: " << e <<
+ info (bloc) << "use the '\\[' escape sequence if this is a "
+ << "wildcard pattern";
+ }
+
+ value r;
+ if (!val.null)
+ {
+ const auto& v (val.as<vector<T>> ());
+ if (i < v.size ())
+ {
+ const T& e (v[i]);
+
+ // Steal the value if possible.
+ //
+ r = &val == val_data ? T (move (const_cast<T&> (e))) : T (e);
+ }
+ }
+
+ // Typify null values so that type-specific subscript (e.g., for
+ // json_value) gets called for chained subscripts.
+ //
+ if (r.null)
+ r.type = &value_traits<T>::value_type;
+
+ return r;
+ }
+
+ // Provide iterate for vector<T> for efficiency.
+ //
+ template <typename T>
+ void
+ vector_iterate (const value& val,
+ const function<void (value&&, bool first)>& f)
+ {
+ const auto& v (val.as<vector<T>> ()); // Never NULL.
+
+ for (auto b (v.begin ()), i (b), e (v.end ()); i != e; ++i)
+ {
+ f (value (*i), i == b);
+ }
+ }
+
// Make sure these are static-initialized together. Failed that VC will make
// sure it's done in the wrong order.
//
@@ -670,8 +732,8 @@ namespace build2
nullptr, // No cast (cast data_ directly).
&vector_compare<T>,
&default_empty<vector<T>>,
- nullptr, // Subscript.
- nullptr // Iterate.
+ &vector_subscript<T>,
+ &vector_iterate<T>
};
// vector<pair<K, V>> value
@@ -999,6 +1061,21 @@ namespace build2
return value (r);
}
+ // Provide iterate for set<T> for efficiency.
+ //
+ template <typename T>
+ void
+ set_iterate (const value& val,
+ const function<void (value&&, bool first)>& f)
+ {
+ const auto& v (val.as<set<T>> ()); // Never NULL.
+
+ for (auto b (v.begin ()), i (b), e (v.end ()); i != e; ++i)
+ {
+ f (value (*i), i == b);
+ }
+ }
+
// Make sure these are static-initialized together. Failed that VC will make
// sure it's done in the wrong order.
//
@@ -1054,7 +1131,7 @@ namespace build2
&set_compare<T>,
&default_empty<set<T>>,
&set_subscript<T>,
- nullptr // Iterate.
+ &set_iterate<T>
};
// map<K, V> value