https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83049
Bug ID: 83049
Summary: Allow overloading of ?: conditional operator
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bugzi...@poradnik-webmastera.com
Target Milestone: ---
C++ standard states than conditional operator ?: cannot be overloaded. However
things changed since this rule was created, and now there are reasons to do
this - in fact gcc provided overloaded version of this operator for vector
extensions. Ability to overload it may be useful in user code too.
One example: in the past I crested small library which was wrapping various
SIMD instructions (SSE, AVX, NEON, and scalars as a pseudo-vector with 1
element). It provided types and defines like this:
template <typename SIMDTraits>
class SIMDVector;
struct SSEDoubleTraits;
#ifdef __SSE2__
typedef SIMDVector<SSEDoubleTraits> DoubleVector;
#define HAS_DOUBLE_VECTOR_2 1
#define DOUBLE_VECTOR_SIZE 2
#endif
With code like above, I was able to abstract out all SIMD stuff and use
DoubleVector in code which performed actual calculations. Ability to overload
?: operator in SIMDVector<> would be helpful and make code more natural.
