How to fix this C++ Memory Management? - c++

Question

I want to build a Memory Management to avoid memory leak but my code has an error that I have no idea how to fix, and how to fix the error in the code?
There: EMC_DELETE cls2; // <-- error: expected a ';'
This code is referenced from a GLSL parser (https://github.com/graphitemaster/glsl-parser/blob/main/ast.h).
// A helper function to help other to reproduce the same example.
std::string pathFolderOrFileName(const std::string &path) {
return path.substr(path.find_last_of("/\\") + 1);
}
template <typename T>
static inline void _destroy(void *self) {
((T*)self)->~T();
free(self);
}
struct Memory {
// Memory Management that's referenced from "emc-language > lexer-parser > ast.h".
Memory() : data(0), dtor(0) { }
template <typename T>
Memory(T *data, const char *file, int line) :
data((void*)data),
dtor(&_destroy<T>),
file(file),
line(line)
{}
void *data;
void (*dtor)(void*);
const char *file;
int line;
void destroy() {
dtor(data);
}
};
template <typename T>
struct Node {
void *operator new(size_t size, std::vector<Memory> *collector, const char *file, int line) throw() {
void *data = malloc(size);
if (data) {
collector->push_back(Memory((T *)data, file, line));
}
return data;
}
void operator delete(void *data, std::vector<Memory> *collector) {
auto &vec = *collector;
for (int i = 0; i < vec.size(); i++) {
if (vec[i].data == data) {
vec.erase(vec.begin() + i);
free(data);
return;
}
}
assert(0);
}
};
// Note: Never use the default 'operator new & delete' because they can cause memory leak.
#define EMC_NEW new(&g_memory, __FILE__, __LINE__) // Use this instead of using the default 'operator new'.
#define EMC_DELETE delete(&g_memory) // Use this instead of using default 'operator delete'.
//----------------------------------------------------------------------------------------------------
class MyBaseClass {
public:
int base_x, base_y;
};
class MyClass : public Node<MyClass> {
public:
int x, y;
MyClass() {
}
~MyClass() {
}
};
std::vector<Memory> g_memory;
int main() {
MyClass *cls0 = EMC_NEW MyClass();
MyClass *cls1 = EMC_NEW MyClass();
MyClass *cls2 = EMC_NEW MyClass();
EMC_DELETE cls2; // <-- error: expected a ';'
for (int i = 0; i < g_memory.size(); i++) {
auto &it = g_memory[i];
printf("%d: (file \"%s\", line %d)\n", i, pathFolderOrFileName(it.file).c_str(), it.line);
}
return 0;
}
Expected output:
0: (file "test_draft.cpp", line 79)
1: (file "test_draft.cpp", line 80)
2: (file "test_draft.cpp", line 81) this line must be removed because cls2 must be deleted.