src/tint/lang/wgsl/ast/node_id.h

// Copyright 2022 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef SRC_TINT_LANG_WGSL_AST_NODE_ID_H_
#define SRC_TINT_LANG_WGSL_AST_NODE_ID_H_

#include <stddef.h>
#include <stdint.h>

namespace tint::ast {

/// NodeID is a unique node identifier for a given Program.
/// NodeIDs are sequentially allocated, starting at 0.
struct NodeID {
    /// Equality operator
    /// @param other the other NodeID
    /// @returns true if the NodeIDs are the same
    bool operator==(NodeID other) const { return value == other.value; }

    /// Less-than comparison operator
    /// @param other the other NodeID
    /// @returns true if the other comes before this node
    bool operator<(NodeID other) const { return value < other.value; }

    /// The numerical value for the node identifier
    uint32_t value = 0;
};

}  // namespace tint::ast

#endif  // SRC_TINT_LANG_WGSL_AST_NODE_ID_H_