llvm/llvm/include/llvm/IR/User.h

//===- llvm/User.h - User class definition ----------------------*- 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 class defines the interface that one who uses a Value must implement.
// Each instance of the Value class keeps track of what User's have handles
// to it.
//
//  * Instructions are the largest class of Users.
//  * Constants may be users of other constants (think arrays and stuff)
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_IR_USER_H
#define LLVM_IR_USER_H

#include "llvm/ADT/iterator.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/IR/Use.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <iterator>

namespace llvm {

template <typename T> class ArrayRef;
template <typename T> class MutableArrayRef;

/// Compile-time customization of User operands.
///
/// Customizes operand-related allocators and accessors.
template <class>
struct OperandTraits;

class User : public Value { … };

// Either Use objects, or a Use pointer can be prepended to User.
static_assert …;
static_assert …;

template<> struct simplify_type<User::op_iterator> { … };
template<> struct simplify_type<User::const_op_iterator> { … };

} // end namespace llvm

#endif // LLVM_IR_USER_H