backend tests progress

include/matador/sql/connection_pool.hpp

@@ -73,14 +73,15 @@ public:
   using connection_pointer = connection_ptr<Connection>;
 
 public:
-  connection_pool(const std::string &dns, unsigned int count)
+  connection_pool(const std::string &dns, size_t count)
   : info_(connection_info::parse(dns)) {
     connection_repo_.reserve(count);
-    for (auto i = 0U; i < count; ++i) {
-      connection_repo_.emplace_back(i+1, info_);
+    while (count) {
+      connection_repo_.emplace_back(count, info_);
       auto &conn = connection_repo_.back();
       idle_connections_.emplace(conn.first, &conn);
       conn.second.open();
+      --count;
     }
   }