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