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//===-- Optional.h - Simple variant for passing optional values ---*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides Optional, a template class modeled in the spirit of
// OCaml's 'opt' variant. The idea is to strongly type whether or not
// a value can be optional.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_OPTIONAL
#define LLVM_CLANG_ANALYSIS_OPTIONAL
namespace clang {
template<typename T>
class Optional {
const T x;
unsigned hasVal : 1;
public:
explicit Optional() : hasVal(false) {}
Optional(const T &y) : x(y), hasVal(true) {}
static inline Optional create(const T* y) {
return y ? Optional(*y) : Optional();
}
const T* getPointer() const { assert(hasVal); return &x; }
operator bool() const { return hasVal; }
const T* operator->() const { return getPointer(); }
const T& operator*() const { assert(hasVal); return x; }
};
} //end clang namespace
namespace llvm {
template <typename T>
struct simplify_type<const ::clang::Optional<T> > {
typedef const T* SimpleType;
static SimpleType getSimplifiedValue(const ::clang::Optional<T> &Val) {
return Val.getPointer();
}
};
template <typename T>
struct simplify_type< ::clang::Optional<T> >
: public simplify_type<const ::clang::Optional<T> > {};
} // end llvm namespace
#endif
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