1.3 KiB
1.3 KiB
[diff.cpp11.lex]
Annex C (informative) Compatibility [diff]
C.5 C++ and ISO C++ 2011 [diff.cpp11]
C.5.2 [lex]: lexical conventions [diff.cpp11.lex]
Affected subclause: [lex.ppnumber]
Change: pp-number can contain one or more single quotes.
Rationale: Necessary to enable single quotes as digit separators.
Effect on original feature: Valid C++ 2011 code may fail to compile or may change meaning in this revision of C++.
For example, the following code is valid both in C++ 2011 and in this revision of C++, but the macro invocation produces different outcomes because the single quotes delimit a character-literal in C++ 2011, whereas they are digit separators in this revision of C++.
[Example 1: #define M(x, ...) __VA_ARGS__int x[2] = { M(1'2,3'4, 5) };// int x[2] = { 5 }; --- C++ 2011// int x[2] = { 3'4, 5 }; --- this revision of C++ â end example]