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query::result_view: add concept

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This commit is contained in:
Paweł Dziepak
2018-06-11 16:39:36 +01:00
parent 2914f64b2d
commit 982f71a804
1 changed files with 17 additions and 2 deletions
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19
query-result-reader.hh
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@@ -144,6 +144,20 @@ struct result_visitor {
void accept_partition_end(const result_row_view& static_row) {}
};
GCC6_CONCEPT(
template<typename Visitor>
concept bool ResultVisitor = requires(Visitor visitor, const partition_key& pkey,
uint32_t row_count, const clustering_key& ckey,
const result_row_view& static_row, const result_row_view& row)
{
visitor.accept_new_partition(pkey, row_count);
visitor.accept_new_partition(row_count);
visitor.accept_new_row(ckey, static_row, row);
visitor.accept_new_row(static_row, row);
visitor.accept_partition_end(static_row);
};
)
class result_view {
ser::query_result_view _v;
friend class result_merger;
@@ -164,8 +178,9 @@ public:
});
}
template <typename ResultVisitor>
void consume(const partition_slice& slice, ResultVisitor&& visitor) {
template <typename Visitor>
GCC6_CONCEPT(requires ResultVisitor<Visitor>)
void consume(const partition_slice& slice, Visitor&& visitor) {
for (auto&& p : _v.partitions()) {
auto rows = p.rows();
auto row_count = rows.size();