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Fix through route to TargetPlatform::TypeDistinguisher.

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This commit is contained in:
Thomas Harte 2021-12-25 17:06:12 -05:00
parent 4d9589af7c
commit 6c606b5506
1 changed files with 13 additions and 1 deletions
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14
Storage/Disk/DiskImage/DiskImage.hpp
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@ -14,6 +14,7 @@
#include "../Disk.hpp"
#include "../Track/Track.hpp"
#include "../../TargetPlatforms.hpp"
namespace Storage {
namespace Disk {
@ -86,8 +87,11 @@ class DiskImageHolderBase: public Disk {
Provides a wrapper that wraps a DiskImage to make it into a Disk, providing caching and,
thereby, an intermediate store for modified tracks so that mutable disk images can either
update on the fly or perform a block update on closure, as appropriate.
Implements TargetPlatform::TypeDistinguisher to return either no information whatsoever, if
the underlying image doesn't implement TypeDistinguisher, or else to pass the call along.
*/
template <typename T> class DiskImageHolder: public DiskImageHolderBase {
template <typename T> class DiskImageHolder: public DiskImageHolderBase, public TargetPlatform::TypeDistinguisher {
public:
template <typename... Ts> DiskImageHolder(Ts&&... args) :
disk_image_(args...) {}
@ -103,6 +107,14 @@ template <typename T> class DiskImageHolder: public DiskImageHolderBase {
private:
T disk_image_;
TargetPlatform::Type target_platform_type() final {
if constexpr (std::is_base_of<TargetPlatform::TypeDistinguisher, T>::value) {
return static_cast<TargetPlatform::TypeDistinguisher *>(&disk_image_)->target_platform_type();
} else {
return TargetPlatform::Type(~0);
}
}
};
#include "DiskImageImplementation.hpp"