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++
.For example:
#define M(x, ...) __VA_ARGS__
int x[2] = { M(1'2,3'4, 5) };