52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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//===--- Printable.h - Print function helpers -------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the Printable struct.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PRINTABLE_H
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#define LLVM_SUPPORT_PRINTABLE_H
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#include <functional>
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namespace llvm {
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class raw_ostream;
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/// Simple wrapper around std::function<void(raw_ostream&)>.
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/// This class is useful to construct print helpers for raw_ostream.
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///
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/// Example:
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/// Printable PrintRegister(unsigned Register) {
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/// return Printable([Register](raw_ostream &OS) {
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/// OS << getRegisterName(Register);
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/// }
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/// }
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/// ... OS << PrintRegister(Register); ...
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///
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/// Implementation note: Ideally this would just be a typedef, but doing so
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/// leads to operator << being ambiguous as function has matching constructors
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/// in some STL versions. I have seen the problem on gcc 4.6 libstdc++ and
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/// microsoft STL.
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class Printable {
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public:
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std::function<void(raw_ostream &OS)> Print;
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Printable(std::function<void(raw_ostream &OS)> Print)
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: Print(std::move(Print)) {}
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};
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inline raw_ostream &operator<<(raw_ostream &OS, const Printable &P) {
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P.Print(OS);
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return OS;
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}
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}
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#endif
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