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60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*******************************************************************************
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* This file is part of the "https://github.com/blackmatov/meta.hpp"
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* For conditions of distribution and use, see copyright notice in LICENSE.md
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* Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
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******************************************************************************/
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#include "../meta_manuals.hpp"
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namespace
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{
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enum class align {
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left,
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right,
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center,
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};
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}
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TEST_CASE("meta/meta_examples/enums/type") {
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namespace meta = meta_hpp;
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// 'align' enumeration type registration
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meta::enum_<align>()
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.evalue_("left", align::left)
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.evalue_("right", align::right)
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.evalue_("center", align::center);
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// resolves a enumeration type by enumerator
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const meta::enum_type align_type = meta::resolve_type(align::left);
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// also, it can be resolved by static enumeration type
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CHECK(align_type == meta::resolve_type<align>());
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// allows to know the underlying type
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CHECK(align_type.get_underlying_type() == meta::resolve_type<int>());
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// prints all enumerators
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fmt::print("* align:\n");
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for ( auto&& [index, evalue] : align_type.get_evalues() ) {
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fmt::print(" - {}:{}\n", index.name, evalue.get_underlying_value());
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}
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}
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TEST_CASE("meta/meta_examples/enums/usage") {
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namespace meta = meta_hpp;
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const align e = align::center;
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// resolves a enumeration type by enumerator instance 'e'
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const meta::enum_type align_type = meta::resolve_type(e);
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// converts the enumerator to its name
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CHECK(align_type.value_to_name(e) == "center");
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// also, it works with dynamic value types
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CHECK(align_type.value_to_name(meta::value{e}) == "center");
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// ... and back again
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CHECK(align_type.name_to_value("center") == e);
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}
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