#include "llvm/ADT/PointerIntPair.h"
#include "llvm/Support/AlignOf.h"
#include "llvm/Support/system_error.h"
-#include "llvm/Support/type_traits.h"
#include <cassert>
-#if LLVM_HAS_CXX11_TYPETRAITS
#include <type_traits>
-#endif
namespace llvm {
-#if LLVM_HAS_CXX11_TYPETRAITS && LLVM_HAS_RVALUE_REFERENCES
template<class T, class V>
typename std::enable_if< std::is_constructible<T, V>::value
, typename std::remove_reference<V>::type>::type &&
moveIfMoveConstructible(V &Val) {
return Val;
}
-#else
-template<class T, class V>
-V &moveIfMoveConstructible(V &Val) {
- return Val;
-}
-#endif
/// \brief Stores a reference that can be changed.
template <typename T>
/// It is used like the following.
/// \code
/// ErrorOr<Buffer> getBuffer();
-/// void handleError(error_code ec);
///
/// auto buffer = getBuffer();
-/// if (!buffer)
-/// handleError(buffer);
+/// if (error_code ec = buffer.getError())
+/// return ec;
/// buffer->write("adena");
/// \endcode
///
template<class T>
class ErrorOr {
template <class OtherT> friend class ErrorOr;
- static const bool isRef = is_reference<T>::value;
- typedef ReferenceStorage<typename remove_reference<T>::type> wrap;
+ static const bool isRef = std::is_reference<T>::value;
+ typedef ReferenceStorage<typename std::remove_reference<T>::type> wrap;
public:
- typedef typename
- conditional< isRef
- , wrap
- , T
- >::type storage_type;
+ typedef typename std::conditional<isRef, wrap, T>::type storage_type;
private:
- typedef typename remove_reference<T>::type &reference;
- typedef typename remove_reference<T>::type *pointer;
+ typedef typename std::remove_reference<T>::type &reference;
+ typedef const typename std::remove_reference<T>::type &const_reference;
+ typedef typename std::remove_reference<T>::type *pointer;
public:
template <class E>
- ErrorOr(E ErrorCode, typename enable_if_c<is_error_code_enum<E>::value ||
- is_error_condition_enum<E>::value,
- void *>::type = 0)
+ ErrorOr(E ErrorCode, typename std::enable_if<is_error_code_enum<E>::value ||
+ is_error_condition_enum<E>::value,
+ void *>::type = 0)
: HasError(true) {
new (getErrorStorage()) error_code(make_error_code(ErrorCode));
}
return *this;
}
-#if LLVM_HAS_RVALUE_REFERENCES
ErrorOr(ErrorOr &&Other) {
moveConstruct(std::move(Other));
}
moveAssign(std::move(Other));
return *this;
}
-#endif
~ErrorOr() {
if (!HasError)
getStorage()->~storage_type();
}
- typedef void (*unspecified_bool_type)();
- static void unspecified_bool_true() {}
-
/// \brief Return false if there is an error.
- operator unspecified_bool_type() const {
- return HasError ? 0 : unspecified_bool_true;
+ LLVM_EXPLICIT operator bool() const {
+ return !HasError;
}
- T &get() { return *getStorage(); }
- const T &get() const { return const_cast<ErrorOr<T> >(this)->get(); }
+ reference get() { return *getStorage(); }
+ const_reference get() const { return const_cast<ErrorOr<T> >(this)->get(); }
error_code getError() const {
return HasError ? *getErrorStorage() : error_code::success();
} else {
// Get other's error.
HasError = true;
- new (getErrorStorage()) error_code(Other);
+ new (getErrorStorage()) error_code(Other.getError());
}
}
new (this) ErrorOr(Other);
}
-#if LLVM_HAS_RVALUE_REFERENCES
template <class OtherT>
void moveConstruct(ErrorOr<OtherT> &&Other) {
if (!Other.HasError) {
this->~ErrorOr();
new (this) ErrorOr(std::move(Other));
}
-#endif
pointer toPointer(pointer Val) {
return Val;
};
template<class T, class E>
-typename enable_if_c<is_error_code_enum<E>::value ||
- is_error_condition_enum<E>::value, bool>::type
+typename std::enable_if<is_error_code_enum<E>::value ||
+ is_error_condition_enum<E>::value, bool>::type
operator ==(ErrorOr<T> &Err, E Code) {
return error_code(Err) == Code;
}