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clean-up & improve (#170)
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10 changed files with 209 additions and 179 deletions
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2019 - 2021 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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@ -1,6 +1,6 @@
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2019 - 2021 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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@ -1,6 +1,6 @@
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2020 - 2021 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2020 - 2022 Daniil Goncharov <neargye@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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@ -1,6 +1,7 @@
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2020 - 2021 Uruha Komachin <uruhakomachin@gmail.com>.
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// Copyright (c) 2020 - 2022 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2020 - 2022 Uruha Komachin <uruhakomachin@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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@ -1,6 +1,7 @@
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// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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// SPDX-License-Identifier: MIT
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// Copyright (c) 2019 - 2021 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
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// Copyright (c) 2020 - 2022 Bela Schaum <schaumb@gmail.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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@ -36,11 +37,10 @@ constexpr std::string_view DoWork<Color::GREEN>() {
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return "override";
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}
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// helper type for the visitor pattern
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// Helper type for the visitor pattern.
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template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
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template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
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int main() {
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Color c = Color::RED;
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@ -54,13 +54,12 @@ int main() {
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magic_enum::enum_switch(lambda, c); // prints "override"
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// with object, explicit enum type
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auto switcher1 = overloaded {
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[] (auto val) -> std::enable_if_t <(Color::BLUE == decltype(val){}())> {
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auto switcher1 = overloaded{
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[] (magic_enum::enum_constant<Color::BLUE>) {
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std::cout << "Blue" << std::endl;
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},
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[] (std::integral_constant<Color, Color::RED>) {
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[] (magic_enum::enum_constant<Color::RED>) {
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std::cout << "Red" << std::endl;
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}
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};
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@ -69,15 +68,14 @@ int main() {
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magic_enum::enum_switch<Color>(switcher1, 1 /* BLUE */); // prints "Blue"
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magic_enum::enum_switch<Color>(switcher1, 0 /* RED */); // prints "Red"
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// explicit result type
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auto switcher2 = overloaded {
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[] (std::integral_constant<Color, Color::GREEN>) {
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auto switcher2 = overloaded{
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[] (magic_enum::enum_constant<Color::GREEN>) {
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return "called with green argument";
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},
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[] (Color other) { // default case
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auto name = magic_enum::enum_name(other); // not empty
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return "default: " + std::string{name.data(), name.size()};
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return "default: " + std::string{name};
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}
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};
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@ -87,15 +85,14 @@ int main() {
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auto empty = magic_enum::enum_switch<std::string>(switcher2, static_cast<Color>(-3)); // returns an empty string
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assert(empty.empty());
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// result with default object
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std::cout << magic_enum::enum_switch<Color, std::string>(switcher2, -3, "unrecognized") << std::endl; // prints "unrecognized"
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auto switcher3 = overloaded {
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[] (std::integral_constant<Color, Color::RED>) {
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auto switcher3 = overloaded{
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[] (magic_enum::enum_constant<Color::RED>) {
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return "red result";
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},
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[] (std::integral_constant<Color, Color::BLUE>) {
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[] (magic_enum::enum_constant<Color::BLUE>) {
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return std::nullopt;
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}
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};
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@ -109,4 +106,4 @@ int main() {
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std::cout << magic_enum::enum_switch(switcher3, Color::GREEN, std::make_optional("cica")).value() << std::endl; // prints default: "cica"
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std::cout << magic_enum::enum_switch(switcher3, Color::RED, std::make_optional("cica")).value() << std::endl; // prints: "red result"
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std::cout << magic_enum::enum_switch(switcher3, Color::BLUE, std::make_optional("cica")).has_value() << std::endl; // prints: false
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}
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}
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