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