King_DuckZ/vectorwrapper
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Check that all indices are valid.

Browse source 
The code tries to make the compiler spit out which one is the
invalid index, if any.
This commit is contained in:
King_DuckZ 2017-07-26 23:31:11 +01:00
parent c1b6bd0500
commit 42f3133640
1 changed files with 34 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
include/vectorwrapper/sequence_range.hpp
View file

@ -41,9 +41,42 @@ namespace vwr {
}; };
} //namespace op } //namespace op
namespace implem {
//sets value to the index of the first I >= MAX or to sizeof...(I) if
//no such value is found
template <size_type MAX, size_type IDX, size_type... I>
struct find_ge_than_max;
template <size_type MAX, size_type IDX, size_type I>
struct find_ge_than_max<MAX, IDX, I> {
static constexpr size_type value =
IDX + (I >= MAX ? 0 : 1);
};
template <size_type MAX, size_type IDX, size_type L, size_type... I>
struct find_ge_than_max<MAX, IDX, L, I...> {
static constexpr size_type value =
(L >= MAX ? IDX : find_ge_than_max<MAX, IDX + 1, I...>::value);
};
//helper to identify the invalid index in the build error messages
template <size_type INVALID_INDEX, bool INVALID>
struct is_invalid_index {
static_assert(not INVALID,
"Invalid index specified, indices must all be >= 0 and <= dimensions"
);
enum {
value = 0
};
};
} //namespace implem
template <typename V, typename OP, typename CMP, size_type... I> template <typename V, typename OP, typename CMP, size_type... I>
class sequence_range_iterator : OP, CMP { class sequence_range_iterator : OP, CMP {
//static_assert(VectorWrapperInfo<V>::dimensions >= sizeof...(I), "Start index out of valid range"); static_assert(not implem::is_invalid_index<
implem::find_ge_than_max<V::dimensions, 0, I...>::value,
sizeof...(I) != implem::find_ge_than_max<V::dimensions, 0, I...>::value
>::value, "");
static_assert(sizeof...(I) > 0, "At least one index must be specified");
public: public:
sequence_range_iterator (const V& parFrom, const V& parUpper); sequence_range_iterator (const V& parFrom, const V& parUpper);
sequence_range_iterator (const V& parCurrent, const V& parFrom, const V& parUpper); sequence_range_iterator (const V& parCurrent, const V& parFrom, const V& parUpper);