add 'which' method for compatibility with boost::variant

2015-02-26 16:23:20 +01:00 · 2015-02-26 16:23:20 +01:00 · a3b7328936
commit a3b7328936
parent da1bc2463d
1 changed files with 4 additions and 0 deletions
--- a/include/mapnik/util/variant.hpp
+++ b/include/mapnik/util/variant.hpp
@ -662,6 +662,10 @@ public:
        return type_index;
    }

+    VARIANT_INLINE int which() const noexcept
+    {
+        return static_cast<int>(sizeof...(Types) - type_index - 1);
+    }
    // visitor
    // unary
    template <typename F, typename V>