diff options
Diffstat (limited to 'src/expr/attribute.h')
| -rw-r--r-- | src/expr/attribute.h | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/src/expr/attribute.h b/src/expr/attribute.h index 46302fc9f..44bf7aae5 100644 --- a/src/expr/attribute.h +++ b/src/expr/attribute.h @@ -61,7 +61,7 @@ class AttributeManager { * getTable<> is a helper template that gets the right table from an * AttributeManager given its type. */ - template <class T, bool context_dep> + template <class T, bool context_dep, class Enable> friend struct getTable; bool d_inGarbageCollection; @@ -190,8 +190,13 @@ namespace attr { /** * The getTable<> template provides (static) access to the * AttributeManager field holding the table. + * + * The `Enable` template parameter is used to instantiate the template + * conditionally: If the template substitution of Enable fails (e.g. when using + * `std::enable_if` in the template parameter and the condition is false), the + * instantiation is ignored due to the SFINAE rule. */ -template <class T, bool context_dep> +template <class T, bool context_dep, class Enable = void> struct getTable; /** Access the "d_bools" member of AttributeManager. */ @@ -208,8 +213,12 @@ struct getTable<bool, false> { }; /** Access the "d_ints" member of AttributeManager. */ -template <> -struct getTable<uint64_t, false> { +template <class T> +struct getTable<T, + false, + // Use this specialization only for unsigned integers + typename std::enable_if<std::is_unsigned<T>::value>::type> +{ static const AttrTableId id = AttrTableUInt64; typedef AttrHash<uint64_t> table_type; static inline table_type& get(AttributeManager& am) { |