Titus Winter

Multi-step refactoring

• Basic atoms of refactoring

Rename a type

namespace oldns {class StringPiece ...}
namespace absl {class string_view ...copy StringPiece }
problems

or

namespace oldns {using StringPiece = absl::string_view}


break with forward declaration. forward declarations no real performance improement

also, ADL causes it to break

instead

namespace oldns {class StringPiece...}
namespace absl { using string_view = oldns::StringPiece;}

then deal with ADL problems

Find a way tso pre/post syntax/semancs can co-exist

Can we change functions?

• small atoms: weaken preconditions; stregthen postconditions
• large atomes: opposite

Changing return types

• void to anything is doable
• into to int64_t?

Can we change templates

Can we change concepts

• Single-step: sure
• Multi-step: No