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adding ability to get the count of items in a static variant

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Daniel Larimer 2015-05-19 11:40:47 -04:00
parent 71cca4559c
commit 2cbb00426c
1 changed files with 12 additions and 6 deletions
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18
include/fc/static_variant.hpp
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@ -155,6 +155,7 @@ struct type_info<T&, Ts...> {
static const bool no_reference_types = false;
static const bool no_duplicates = position<T, Ts...>::pos == -1 && type_info<Ts...>::no_duplicates;
static const size_t size = type_info<Ts...>::size > sizeof(T&) ? type_info<Ts...>::size : sizeof(T&);
static const size_t count = 1 + type_info<Ts...>::count;
};
template<typename T, typename... Ts>
@ -162,12 +163,14 @@ struct type_info<T, Ts...> {
static const bool no_reference_types = type_info<Ts...>::no_reference_types;
static const bool no_duplicates = position<T, Ts...>::pos == -1 && type_info<Ts...>::no_duplicates;
static const size_t size = type_info<Ts...>::size > sizeof(T) ? type_info<Ts...>::size : sizeof(T&);
static const size_t count = 1 + type_info<Ts...>::count;
};
template<>
struct type_info<> {
static const bool no_reference_types = true;
static const bool no_duplicates = true;
static const size_t count = 0;
static const size_t size = 0;
};
@ -314,13 +317,15 @@ public:
return impl::storage_ops<0, Types...>::apply(_tag, storage, v);
}
void set_which( int w ) {
this->~static_variant();
_tag = w;
impl::storage_ops<0, Types...>::con(_tag, storage);
}
static int count() { return impl::type_info<Types...>::count; }
void set_which( int w ) {
FC_ASSERT( w < count() );
this->~static_variant();
_tag = w;
impl::storage_ops<0, Types...>::con(_tag, storage);
}
int which() const {return _tag;}
int which() const {return _tag;}
};
template<typename Result>
@ -369,4 +374,5 @@ struct visitor {
s.visit( to_static_variant(ar[1]) );
}
template<typename... T> struct get_typename<T...> { static const char* name() { return typeid(static_variant<T...>).name(); } };
} // namespace fc