inserts a definition of swap function in a source of a class.
inserts a definition of swap function in a source of a class.

hiroyuki-seki/hryky-codebase,hiroyuki-seki/hryky-codebase,hiroyuki-seki/hryky-codebase,hiroyuki-seki/hryky-codebase,hiroyuki-seki/hryky-codebase,hiroyuki-seki/hryky-codebase