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