Annex C (informative) Compatibility [diff]

C.2 C++ and ISO C++ 2003 [diff.cpp03]

C.2.7 Clause [temp]: templates [diff.cpp03.temp]

Change: Remove export.
Rationale: No implementation consensus.
Effect on original feature: A valid C++ 2003 declaration containing export is ill-formed in this International Standard.

Change: Remove whitespace requirement for nested closing template right angle brackets.
Rationale: Considered a persistent but minor annoyance. Template aliases representing non-class types would exacerbate whitespace issues.
Effect on original feature: Change to semantics of well-defined expression. A valid C++ 2003 expression containing a right angle bracket (“>”) followed immediately by another right angle bracket may now be treated as closing two templates. For example, the following code is valid in C++ 2003 because “>>” is a right-shift operator, but invalid in this International Standard because “>>” closes two templates.

template <class T> struct X { };
template <int N> struct Y { };
X< Y< 1 >> 2 > > x;

Change: Allow dependent calls of functions with internal linkage.
Rationale: Overly constrained, simplify overload resolution rules.
Effect on original feature: A valid C++ 2003 program could get a different result than this International Standard.