diff options
Diffstat (limited to 'build2/variable')
| -rw-r--r-- | build2/variable | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/build2/variable b/build2/variable index a2490ac..029aafa 100644 --- a/build2/variable +++ b/build2/variable @@ -214,10 +214,15 @@ namespace build2 template <typename T> typename value_traits<T>::const_type as (const value&); // Try to "assign" a simple value type to the value stored in name. Return - // false if the value is not valid for this type. + // false if the value is not valid for this type. The second version is + // called for a pair and it is expected to merge the result into the first + // name. // template <typename T> bool assign (name&); + template <typename T> bool assign (name&, name&); + // Name cast. Can only be called after assign() above returned true. + // template <typename T> typename value_traits<T>::type as (name&); template <typename T> typename value_traits<T>::const_type as (const name&); @@ -270,7 +275,7 @@ namespace build2 static type as (value&); static const_type as (const value&); - static bool assign (name&); + static bool assign (name&, name*); static void assign (value&, bool); static void append (value&, bool); @@ -293,7 +298,7 @@ namespace build2 static type as (value&); static const_type as (const value&); - static bool assign (name&); + static bool assign (name&, name*); static void assign (value&, string); static void append (value&, string); @@ -316,7 +321,7 @@ namespace build2 static type as (value&); static const_type as (const value&); - static bool assign (name&); + static bool assign (name&, name*); static void assign (value&, dir_path); static void append (value&, dir_path); @@ -339,7 +344,7 @@ namespace build2 static type as (value&); static const_type as (const value&); - static bool assign (name&) {return true;} + static bool assign (name&, name* r) {return r == nullptr;} static void assign (value&, name); static void append (value&, name) = delete; |