diff options
Diffstat (limited to 'libbuild2/variable.ixx')
| -rw-r--r-- | libbuild2/variable.ixx | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libbuild2/variable.ixx b/libbuild2/variable.ixx index 9b24b9d..fd78842 100644 --- a/libbuild2/variable.ixx +++ b/libbuild2/variable.ixx @@ -114,6 +114,22 @@ namespace build2 return *this; } + template <typename T> + inline value& value:: + prepend (T v) + { + assert (type == &value_traits<T>::value_type || (type == nullptr && null)); + + // Prepare the receiving value. + // + if (type == nullptr) + type = &value_traits<T>::value_type; + + value_traits<T>::prepend (*this, move (v)); + null = false; + return *this; + } + inline value& value:: operator= (names v) { @@ -867,6 +883,26 @@ namespace build2 new (&v.data_) map<K, V> (move (x)); } + template <typename K, typename V> + inline void value_traits<std::map<K, V>>:: + prepend (value& v, map<K, V>&& x) + { + if (v) + { + map<K, V>& m (v.as<map<K, V>> ()); + + m.swap (x); + + // Note that this will only move values. Keys (being const) are still + // copied. + // + m.insert (make_move_iterator (x.begin ()), + make_move_iterator (x.end ())); + } + else + new (&v.data_) map<K, V> (move (x)); + } + // variable_pool // inline const variable& variable_pool:: |