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//===- llvm/Support/Streams.h - Wrappers for iostreams ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a wrapper for the STL I/O streams. It prevents the need
// to include <iostream> in a file just to get I/O.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_STREAMS_H
#define LLVM_SUPPORT_STREAMS_H
#include <iosfwd>
namespace llvm {
/// BaseStream - Acts like the STL streams. It's a wrapper for the std::cerr,
/// std::cout, std::cin, etc. streams. However, it doesn't require #including
/// @verbatim <iostream> @endverbatm in every file (doing so increases static
/// c'tors & d'tors in the object code).
///
template <typename StreamTy>
class BaseStream {
StreamTy *Stream;
public:
BaseStream() : Stream(0) {}
BaseStream(StreamTy &S) : Stream(&S) {}
BaseStream(StreamTy *S) : Stream(S) {}
StreamTy *stream() const { return Stream; }
inline BaseStream &operator << (StreamTy &(*Func)(StreamTy&)) {
if (Stream) *Stream << Func;
return *this;
}
template <typename Ty>
BaseStream &operator << (const Ty &Thing) {
if (Stream) *Stream << Thing;
return *this;
}
template <typename Ty>
BaseStream &operator >> (const Ty &Thing) {
if (Stream) *Stream >> Thing;
return *this;
}
operator StreamTy* () { return Stream; }
bool operator == (const StreamTy &S) { return &S == Stream; }
bool operator != (const StreamTy &S) { return !(*this == S); }
bool operator == (const BaseStream &S) { return S.Stream == Stream; }
bool operator != (const BaseStream &S) { return !(*this == S); }
};
typedef BaseStream<std::ostream> OStream;
typedef BaseStream<std::istream> IStream;
typedef BaseStream<std::stringstream> StringStream;
extern OStream cout;
extern OStream cerr;
extern IStream cin;
} // End llvm namespace
#endif
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