diff options
author | Boris Kolpackov <boris@codesynthesis.com> | 2018-08-09 09:36:23 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2018-08-09 09:36:23 +0200 |
commit | 67b36b32e19e17db9b1e5c72deb8db7202a0f41b (patch) | |
tree | 6c8141f43232569ff930c401b40f74f130743696 /build2/variable.ixx | |
parent | 4ce9366b563ceb4939403dbf498b6a5126661ee0 (diff) |
Add support for returning optional<T> from (buildfile) function implementations
Diffstat (limited to 'build2/variable.ixx')
-rw-r--r-- | build2/variable.ixx | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/build2/variable.ixx b/build2/variable.ixx index 8c16559..bf5fb92 100644 --- a/build2/variable.ixx +++ b/build2/variable.ixx @@ -24,6 +24,14 @@ namespace build2 new (&data_) names (move (ns)); } + inline value:: + value (optional<names> ns) + : type (nullptr), null (!ns), extra (0) + { + if (!null) + new (&data_) names (move (*ns)); + } + template <typename T> inline value:: value (T v) @@ -33,6 +41,18 @@ namespace build2 null = false; } + template <typename T> + inline value:: + value (optional<T> v) + : type (&value_traits<T>::value_type), null (true), extra (0) + { + if (v) + { + value_traits<T>::assign (*this, move (*v)); + null = false; + } + } + inline value& value:: operator= (reference_wrapper<value> v) { |