Annex C (informative) Compatibility [diff]

Change: Only literals are integer null pointer constants.

Rationale: Removing surprising interactions with templates and constant expressions.

Effect on original feature: Valid C++ 2003 code may fail to compile or produce different results in this International Standard.

For example:

void f(void *);     // #1
void f(...);        // #2
template<int N> void g() {
  f(0*N);           // calls #2; used to call #1
}

Change: Specify rounding for results of integer / and %.

Rationale: Increase portability, C99 compatibility.

Effect on original feature: Valid C++ 2003 code that uses integer division rounds the result toward 0 or toward negative infinity, whereas this International Standard always rounds the result toward 0.

Change: && is valid in a type-name.

Rationale: Required for new features.

Effect on original feature: Valid C++ 2003 code may fail to compile or produce different results in this International Standard.

For example:

bool b1 = new int && false;             // previously false, now ill-formed
struct S { operator int(); };
bool b2 = &S::operator int && false;    // previously false, now ill-formed