Technical data

Cray Standard C/C++ Dialects [B]
struct A { };
struct B : public A {
B& operator=(A&);
};
By default, as well as in cfront-compatibility mode, there will be no implicit
declaration of B::operator=(const B&), whereas in strict-ANSI
mode, B::operator=(A&) is not a copy assignment operator and
B::operator=(const B&) is implicitly declared.
• Implicit type conversion between a pointer to an extern "C" function and
a pointer to an extern "C++" function is permitted. The following is an
example:
extern "C" void f(); // f’s type has extern "C" linkage
void (*pf)() // pf points to an extern "C++" function
= &f; // error unless implicit conversion allowed
• The ? operator, for which the second and third operands are string literals or
wide string literals, can be implicitly converted to one of the following:
char *
wchar_t *
In C++ string literals are const. There is a deprecated implicit conversion
that allows conversion of a string literal to char *, dropping the const. That
conversion, however, applies only to simple string literals. Allowing it for the
result of a ? operation is an extension:
char *p = x ? "abc" : "def";
B.4 Extensions Accepted in C or C++ Mode
The following extensions are accepted in C or C++ mode except when strict
standard conformance modes is enabled, in which case a warning or caution
message may be issued.
• The special lint comments /*ARGSUSED*/, /*VARARGS*/ (with or without
a count of nonvarying arguments), and /*NOTREACHED*/ are recognized.
• A translation unit (input file) can contain no declarations.
• Comment text can appear at the ends of preprocessing directives.
• Bit fields can have base types that are enum or integral types in addition to
int and unsigned int. This corresponds to A.6.5.8 in the ANSI Common
Extensions appendix.
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