61 lines
1.7 KiB
C
61 lines
1.7 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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namespace open3d {
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namespace utility {
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/// Generic functor for overloading (lambda) functions.
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/// See Overload(...) function on how to use it.
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///
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/// \note In C++17, this could be simplified to:
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///
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/// \code
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/// template <typename... Ts>
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/// struct Overloaded : Ts... {
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/// using Ts::operator()...;
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/// };
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/// \endcode
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template <typename... Ts>
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struct Overloaded;
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template <typename T1, typename... Ts>
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struct Overloaded<T1, Ts...> : T1, Overloaded<Ts...> {
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Overloaded(T1 t1, Ts... ts) : T1(t1), Overloaded<Ts...>(ts...) {}
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using T1::operator();
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using Overloaded<Ts...>::operator();
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};
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template <typename T1>
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struct Overloaded<T1> : T1 {
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Overloaded(T1 t1) : T1(t1) {}
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using T1::operator();
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};
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/// Overloads an arbitrary set of (lambda) functions.
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///
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/// Example:
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///
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/// \code
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/// auto Func = utility::Overload(
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/// [&](int i) { utility::LogInfo("Got int {}", i); },
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/// [&](float f) { utility::LogInfo("Got float {}", f); });
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///
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/// Func(1); // Prints: Got int 1
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/// Func(2.4f); // Prints: Got float 2.4
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/// \endcode
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template <typename... Ts>
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Overloaded<Ts...> Overload(Ts... ts) {
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return Overloaded<Ts...>(ts...);
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}
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} // namespace utility
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} // namespace open3d
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