FileSys/DelayGenerator: add missing #include and virtual dtor (#4363)

* FileSys/DelayGenerator: add missing #include and virtual dtor

Added the needed include so that it won't cause error if another file includes this without including the depended files

Deleting a virtual class via base type without virtual dtor is UB, which happens inFileBackend.

* FileSys/DelayGenerator: move function definition into cpp file/n/nTo avoid generating vtable in all units that includes the header file

* filesys/delay_generator: rearrange #include

src/core/CMakeLists.txt

@@ -58,6 +58,7 @@ add_library(core STATIC
     file_sys/disk_archive.h
     file_sys/errors.h
     file_sys/file_backend.h
+    file_sys/delay_generator.cpp
     file_sys/delay_generator.h
     file_sys/ivfc_archive.cpp
     file_sys/ivfc_archive.h

src/core/file_sys/delay_generator.cpp

@@ -0,0 +1,22 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include "core/file_sys/delay_generator.h"
+
+namespace FileSys {
+
+DelayGenerator::~DelayGenerator() = default;
+
+u64 DefaultDelayGenerator::GetReadDelayNs(std::size_t length) {
+    // This is the delay measured for a romfs read.
+    // For now we will take that as a default
+    static constexpr u64 slope(94);
+    static constexpr u64 offset(582778);
+    static constexpr u64 minimum(663124);
+    u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+    return IPCDelayNanoseconds;
+}
+
+} // namespace FileSys

src/core/file_sys/delay_generator.h

@@ -4,10 +4,14 @@
 
 #pragma once
 
+#include <cstddef>
+#include "common/common_types.h"
+
 namespace FileSys {
 
 class DelayGenerator {
 public:
+    virtual ~DelayGenerator();
     virtual u64 GetReadDelayNs(std::size_t length) = 0;
 
     // TODO (B3N30): Add getter for all other file/directory io operations
@@ -15,15 +19,7 @@ public:
 
 class DefaultDelayGenerator : public DelayGenerator {
 public:
-    u64 GetReadDelayNs(std::size_t length) override {
-        // This is the delay measured for a romfs read.
-        // For now we will take that as a default
-        static constexpr u64 slope(94);
-        static constexpr u64 offset(582778);
-        static constexpr u64 minimum(663124);
-        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
-        return IPCDelayNanoseconds;
-    }
+    u64 GetReadDelayNs(std::size_t length) override;
 };
 
 } // namespace FileSys