Revert "Use if constexpr to make things a lot more readable"

This reverts commit d62ca9f87906be6f046fe9d07afb8bfb69c166e3.

1 files changed, 24 insertions, 20 deletions

diff --git a/src/database/table.hpp b/src/database/table.hpp
index eb68418..680e7cc 100644
--- a/src/database/table.hpp
+++ b/src/database/table.hpp
@@ -93,32 +93,36 @@ class Table
  private:
 
   template <std::size_t N=0>
-  void add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns)
+  typename std::enable_if<N < sizeof...(T), void>::type
+  add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns)
   {
-    if constexpr(N < sizeof...(T))
-      {
-        using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
-        if (existing_columns.count(ColumnType::name) == 0)
-          add_column_to_table<ColumnType>(db, this->name);
-        add_column_if_not_exists<N + 1>(db, existing_columns);
-      }
+    using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
+    if (existing_columns.count(ColumnType::name) == 0)
+      add_column_to_table<ColumnType>(db, this->name);
+    add_column_if_not_exists<N+1>(db, existing_columns);
   }
+  template <std::size_t N=0>
+  typename std::enable_if<N == sizeof...(T), void>::type
+  add_column_if_not_exists(DatabaseEngine&, const std::set<std::string>&)
+  {}
 
   template <std::size_t N=0>
-  void add_column_create(DatabaseEngine& db, std::string& str)
+  typename std::enable_if<N < sizeof...(T), void>::type
+  add_column_create(DatabaseEngine& db, std::string& str)
   {
-    if constexpr(N < sizeof...(T))
-      {
-        using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
-        str += ColumnType::name;
-        str += " ";
-        str += ToSQLType<ColumnType>(db);
-        if (N != sizeof...(T) - 1)
-          str += ",";
-
-        add_column_create<N + 1>(db, str);
-      }
+    using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
+    str += ColumnType::name;
+    str += " ";
+    str += ToSQLType<ColumnType>(db);
+    if (N != sizeof...(T) - 1)
+      str += ",";
+
+    add_column_create<N+1>(db, str);
   }
+  template <std::size_t N=0>
+  typename std::enable_if<N == sizeof...(T), void>::type
+  add_column_create(DatabaseEngine&, std::string&)
+  { }
 
   const std::string name;
 };