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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===--- Printable.h - Print function helpers -------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines the Printable struct. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_SUPPORT_PRINTABLE_H |
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| 14 | #define LLVM_SUPPORT_PRINTABLE_H |
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| 15 | |||
| 16 | #include <functional> |
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| 17 | #include <utility> |
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| 18 | |||
| 19 | namespace llvm { |
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| 20 | |||
| 21 | class raw_ostream; |
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| 22 | |||
| 23 | /// Simple wrapper around std::function<void(raw_ostream&)>. |
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| 24 | /// This class is useful to construct print helpers for raw_ostream. |
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| 25 | /// |
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| 26 | /// Example: |
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| 27 | /// Printable printRegister(unsigned Register) { |
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| 28 | /// return Printable([Register](raw_ostream &OS) { |
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| 29 | /// OS << getRegisterName(Register); |
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| 30 | /// }); |
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| 31 | /// } |
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| 32 | /// ... OS << printRegister(Register); ... |
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| 33 | /// |
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| 34 | /// Implementation note: Ideally this would just be a typedef, but doing so |
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| 35 | /// leads to operator << being ambiguous as function has matching constructors |
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| 36 | /// in some STL versions. I have seen the problem on gcc 4.6 libstdc++ and |
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| 37 | /// microsoft STL. |
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| 38 | class Printable { |
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| 39 | public: |
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| 40 | std::function<void(raw_ostream &OS)> Print; |
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| 41 | Printable(std::function<void(raw_ostream &OS)> Print) |
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| 42 | : Print(std::move(Print)) {} |
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| 43 | }; |
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| 44 | |||
| 45 | inline raw_ostream &operator<<(raw_ostream &OS, const Printable &P) { |
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| 46 | P.Print(OS); |
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| 47 | return OS; |
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| 48 | } |
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| 49 | |||
| 50 | } // namespace llvm |
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| 51 | |||
| 52 | #endif |