1 //===--- Printable.h - Print function helpers -------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the Printable struct.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_SUPPORT_PRINTABLE_H
14 #define LLVM_SUPPORT_PRINTABLE_H
23 /// Simple wrapper around std::function<void(raw_ostream&)>.
24 /// This class is useful to construct print helpers for raw_ostream.
27 /// Printable PrintRegister(unsigned Register) {
28 /// return Printable([Register](raw_ostream &OS) {
29 /// OS << getRegisterName(Register);
32 /// ... OS << PrintRegister(Register); ...
34 /// Implementation note: Ideally this would just be a typedef, but doing so
35 /// leads to operator << being ambiguous as function has matching constructors
36 /// in some STL versions. I have seen the problem on gcc 4.6 libstdc++ and
40 std::function<void(raw_ostream &OS)> Print;
41 Printable(std::function<void(raw_ostream &OS)> Print)
42 : Print(std::move(Print)) {}
45 inline raw_ostream &operator<<(raw_ostream &OS, const Printable &P) {