add ready connection

src/pgxx/pgxx.hpp

@@ -24,6 +24,8 @@ namespace pgxx
       std::map<std::string, pool_connection> m_data_connections;
 
     public:
+      bool ready() { return m_data_connections.size() != 0; }
+
       void init(std::string connection_name, int connection_count, std::string connection_url)
       {
         m_data_connections[connection_name] = pool_connection { connection_count, connection_url };

tests/main.cpp

@@ -18,6 +18,9 @@ auto main(int argc, char* args[]) -> int
     throw;
   }
 
+  if (!PGXX().ready())
+    hack::log()("error connection");
+
   // pgxx::JSON j { 
   //   { 
   //     "params", { { "key_1", 1 }, { "key2", "value" } }