#ifndef LLVM_ADT_OPTIONAL
#define LLVM_ADT_OPTIONAL
+#include "llvm/Support/Compiler.h"
#include <cassert>
+#if LLVM_HAS_RVALUE_REFERENCES
+#include <utility>
+#endif
+
namespace llvm {
template<typename T>
explicit Optional() : x(), hasVal(false) {}
Optional(const T &y) : x(y), hasVal(true) {}
+#if LLVM_HAS_RVALUE_REFERENCES
+ Optional(T &&y) : x(std::forward<T>(y)), hasVal(true) {}
+#endif
+
static inline Optional create(const T* y) {
return y ? Optional(*y) : Optional();
}
}
const T* getPointer() const { assert(hasVal); return &x; }
- const T& getValue() const { assert(hasVal); return x; }
+ const T& getValue() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
operator bool() const { return hasVal; }
bool hasValue() const { return hasVal; }
const T* operator->() const { return getPointer(); }
- const T& operator*() const { assert(hasVal); return x; }
+ const T& operator*() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
+
+#if LLVM_HAS_RVALUE_REFERENCE_THIS
+ T&& getValue() && { assert(hasVal); return std::move(x); }
+ T&& operator*() && { assert(hasVal); return std::move(x); }
+#endif
};
template<typename T> struct simplify_type;
struct simplify_type<Optional<T> >
: public simplify_type<const Optional<T> > {};
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator==(const Optional<T> &X, const Optional<U> &Y);
+
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator!=(const Optional<T> &X, const Optional<U> &Y);
+
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator<(const Optional<T> &X, const Optional<U> &Y);
+
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator<=(const Optional<T> &X, const Optional<U> &Y);
+
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator>=(const Optional<T> &X, const Optional<U> &Y);
+
+/// \brief Poison comparison between two \c Optional objects. Clients needs to
+/// explicitly compare the underlying values and account for empty \c Optional
+/// objects.
+///
+/// This routine will never be defined. It returns \c void to help diagnose
+/// errors at compile time.
+template<typename T, typename U>
+void operator>(const Optional<T> &X, const Optional<U> &Y);
+
} // end llvm namespace
#endif