Subject: Opaque types, typedefs, and contract identifiers

A typedef's underlying type, an opaque type's hidden field, a pimpl alias, or a stable numeric/macro identifier (a serialization tag, a public macro or header constant) changes -- the contract was the name staying stable, not any particular layout.

9 case(s). ← back to all subjects

Cases

Case	Title	Verdict	Category
case28_typedef_opaque	Typedef and Opaque Type Changes	🔴 BREAKING	Breaking
case62_type_field_added_compatible	Type Field Added (Compatible — Opaque Struct)	🟢 COMPATIBLE	Addition (Compatible)
case73_typedef_underlying_changed	Typedef Underlying Type Changed	🔴 BREAKING	Breaking
case80_pimpl_shared_to_unique	Pimpl Alias Switched from shared_ptr to unique_ptr	🔴 BREAKING	Breaking
case81_serialization_tag_reassigned	Serialization Tag ID Reassigned	🔴 BREAKING	Breaking
case95_allocator_nested_typedef_removed	Allocator Nested-Typedef Removed	🔴 BREAKING	Breaking
case124_header_constant_value_changed	Header Constant Value Changed	🟠 API_BREAK	API Break
case156_public_macro_removed	_public_macro_removed — Public macro removed	🟠 API_BREAK	API Break
case158_public_typedef_removed	Public Typedef Removed	🟠 API_BREAK	API Break