[expr.cond]
Change: A conditional expression with a throw expression as its second or third
operand keeps the type and value category of the other operand.
Rationale: Formerly mandated conversions (lvalue-to-rvalue ([conv.lval]),
array-to-pointer ([conv.array]), and function-to-pointer ([conv.func])
standard conversions), especially the creation of the temporary due to
lvalue-to-rvalue conversion, were considered gratuitous and surprising.
Effect on original feature: Valid C++ 2011 code that relies on the conversions may behave differently
in this International Standard:
struct S {
int x = 1;
void mf() { x = 2; }
};
int f(bool cond) {
S s;
(cond ? s : throw 0).mf();
return s.x;
}
In C++ 2011, f(true) returns 1. In this International Standard, it returns 2.
sizeof(true ? "" : throw 0)
In C++ 2011, the expression yields sizeof(const char*). In this International Standard, it yields sizeof(const char[1]).