90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018-2019 Danny Robson <danny@nerdcruft.net>
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*/
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#include "description.hpp"
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#include "../types.hpp"
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namespace cruft::types {
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/// Call a functor with the supplied arguments and a type_tag for the
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/// described native type.
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///
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/// If the type does not exist then throw and invalid_argument exception.
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///
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/// We split the calls into two here so that there's no possibility of
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/// recursion (which will blow up the compiler) when we handle the
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/// dispatch of enums.
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template <typename FunctionT, typename ...Args>
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decltype(auto)
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visit (description const &descriminator, FunctionT &&func, Args&&...args)
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{
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#define INVOKE(KLASS) \
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return std::invoke( \
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std::forward<FunctionT> (func), \
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std::forward<Args> (args)..., \
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type_tag<KLASS> {} \
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);
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switch (descriminator.category) {
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case category ::NONE: INVOKE(void)
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case category::REAL:
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switch (descriminator.width) {
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case 4: INVOKE(f32)
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case 8: INVOKE(f64)
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default:
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throw std::invalid_argument ("Unsupported floating point width");
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}
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case category::BOOL: INVOKE(bool)
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case category::ENUM: {
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if (descriminator.signedness) {
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switch (descriminator.width) {
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case 1: INVOKE(unknown_enum_tag<i08>)
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case 2: INVOKE(unknown_enum_tag<i16>)
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case 3: INVOKE(unknown_enum_tag<i32>)
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case 4: INVOKE(unknown_enum_tag<i64>)
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}
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} else {
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switch (descriminator.width) {
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case 1: INVOKE(unknown_enum_tag<u08>)
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case 2: INVOKE(unknown_enum_tag<u16>)
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case 3: INVOKE(unknown_enum_tag<u32>)
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case 4: INVOKE(unknown_enum_tag<u64>)
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}
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}
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break;
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}
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case category::INTEGER:
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CHECK_EQ (category::INTEGER, descriminator.category);
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if (descriminator.signedness) {
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switch (descriminator.width) {
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case 1: INVOKE(i08)
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case 2: INVOKE(i16)
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case 3: INVOKE(i32)
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case 4: INVOKE(i64)
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}
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} else {
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switch (descriminator.width) {
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case 1: INVOKE(u08)
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case 2: INVOKE(u16)
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case 3: INVOKE(u32)
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case 4: INVOKE(u64)
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}
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}
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unhandled (descriminator.category);
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}
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unhandled (descriminator.category);
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#undef INVOKE
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}
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}
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