Preprocessor.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#define OPEN3D_FIX_MSVC_(...) __VA_ARGS__
 
#define OPEN3D_CONCAT_IMPL_(s1, s2) s1##s2
#define OPEN3D_CONCAT(s1, s2) OPEN3D_CONCAT_IMPL_(s1, s2)
 
#define OPEN3D_STRINGIFY_IMPL_(s) #s
#define OPEN3D_STRINGIFY(s) OPEN3D_STRINGIFY_IMPL_(s)
 
#define OPEN3D_GET_NTH_ARG_(...) \
    OPEN3D_FIX_MSVC_(OPEN3D_GET_NTH_ARG_IMPL_(__VA_ARGS__))
#define OPEN3D_GET_NTH_ARG_IMPL_(arg1, arg2, arg3, arg4, arg5, arg6, arg7, \
                                 arg8, arg9, arg10, N, ...)                \
    N
#define OPEN3D_REVERSE_NUM_SEQUENCE_() 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
#define OPEN3D_NUM_ARGS(...) \
    OPEN3D_GET_NTH_ARG_(__VA_ARGS__, OPEN3D_REVERSE_NUM_SEQUENCE_())
 
#define OPEN3D_OVERLOAD(func, ...) \
    OPEN3D_CONCAT(func, OPEN3D_NUM_ARGS(__VA_ARGS__))