Annex C (informative) Compatibility [diff]

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

C.2.2 Clause [conv]: standard conversions [diff.cpp03.conv]

[conv.ptr]
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, as the following example illustrates:

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