[diff.cpp17.library] (original) (raw)

Annex C (informative) Compatibility [diff]

C.3 C++ and ISO C++ 2017 [diff.cpp17]

C.3.10 [library]: library introduction [diff.cpp17.library]

Affected subclause: [headers]

Change: New headers.

Rationale: New functionality.

Effect on original feature: The following C++ headers are new:,,,,,,,,,,,,,,, and.

Valid C++ 2017 code that #includes headers with these names may be invalid in this revision of C++.

Affected subclause: [headers]

Change: Remove vacuous C++ header files.

Rationale: The empty headers implied a false requirement to achieve C compatibility with the C++ headers.

Effect on original feature: A valid C++ 2017 program that #includes any of the following headers may fail to compile:<ccomplex>,<ciso646>,<cstdalign>,<cstdbool>, and<ctgmath>.

To retain the same behavior:

• a #include of <ccomplex> can be replaced by a #include of ,
• a #include of <ctgmath> can be replaced by a #include of and a #include of , and
• a #include of<ciso646>,<cstdalign>, or<cstdbool>can simply be removed.