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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
//===--- 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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