diff options
Diffstat (limited to 'build2/variable')
| -rw-r--r-- | build2/variable | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/build2/variable b/build2/variable index b5a32d8..57debfa 100644 --- a/build2/variable +++ b/build2/variable @@ -21,6 +21,7 @@ namespace build2 { class value; struct variable; + template <typename> struct lookup; struct value_type { @@ -185,15 +186,20 @@ namespace build2 bool operator== (const value&, const value&); bool operator!= (const value&, const value&); - // Value cast. + // Value cast. The first three expect the value to be not NULL. The cast + // from lookup expects the value to aslo be defined. // // Why are these non-members? The cast is easier on the eyes and is also // consistent with the cast operators. The other two are for symmetry. // + // template <typename T> T& cast (value&); template <typename T> T&& cast (value&&); template <typename T> const T& cast (const value&); + template <typename T> T& cast (const lookup<value>&); + template <typename T> const T& cast (const lookup<const value>&); + // Assign value type to the value. Variable is normally only used for // diagnostics. // |