66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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// ----------------------------------------------------------------------------
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// - Open3D: www.open3d.org -
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// ----------------------------------------------------------------------------
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// Copyright (c) 2018-2023 www.open3d.org
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// SPDX-License-Identifier: MIT
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// ----------------------------------------------------------------------------
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#pragma once
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/// OPEN3D_FIX_MSVC_(...)
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///
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/// Internal helper function which defers the evaluation of the enclosed
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/// expression.
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///
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/// Use this macro only to workaround non-compliant behaviour of the MSVC
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/// preprocessor.
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///
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/// Note: Could be dropped in the future if the compile flag /Zc:preprocessor
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/// can be applied.
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#define OPEN3D_FIX_MSVC_(...) __VA_ARGS__
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/// OPEN3D_CONCAT(s1, s2)
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///
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/// Concatenates the expanded expressions s1 and s2.
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#define OPEN3D_CONCAT_IMPL_(s1, s2) s1##s2
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#define OPEN3D_CONCAT(s1, s2) OPEN3D_CONCAT_IMPL_(s1, s2)
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/// OPEN3D_STRINGIFY(s)
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///
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/// Converts the expanded expression s to a string.
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#define OPEN3D_STRINGIFY_IMPL_(s) #s
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#define OPEN3D_STRINGIFY(s) OPEN3D_STRINGIFY_IMPL_(s)
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/// OPEN3D_NUM_ARGS(...)
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///
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/// Returns the number of supplied arguments.
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///
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/// Note: Only works for 1-10 arguments.
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#define OPEN3D_GET_NTH_ARG_(...) \
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OPEN3D_FIX_MSVC_(OPEN3D_GET_NTH_ARG_IMPL_(__VA_ARGS__))
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#define OPEN3D_GET_NTH_ARG_IMPL_(arg1, arg2, arg3, arg4, arg5, arg6, arg7, \
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arg8, arg9, arg10, N, ...) \
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N
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#define OPEN3D_REVERSE_NUM_SEQUENCE_() 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
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#define OPEN3D_NUM_ARGS(...) \
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OPEN3D_GET_NTH_ARG_(__VA_ARGS__, OPEN3D_REVERSE_NUM_SEQUENCE_())
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/// OPEN3D_OVERLOAD(func, ...)
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///
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/// Overloads the enumerated macros func1, func2, etc. based on the number of
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/// additional arguments.
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///
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/// Example:
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///
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/// \code
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/// #define FOO_1(x1) foo(x1)
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/// #define FOO_2(x1, x2) bar(x1, x2)
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/// #define FOO(...) '\'
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/// OPEN3D_FIX_MSVC_(OPEN3D_OVERLOAD(FOO_, __VA_ARGS__)(__VA_ARGS__))
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///
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/// FOO(1) -> foo(1)
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/// FOO(2, 3) -> bar(2, 3)
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/// \endcode
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#define OPEN3D_OVERLOAD(func, ...) \
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OPEN3D_CONCAT(func, OPEN3D_NUM_ARGS(__VA_ARGS__))
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