You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.7 KiB
65 lines
1.7 KiB
#pragma once
|
|
|
|
#include "cow.h"
|
|
|
|
#include <memory>
|
|
|
|
#include "cow/slice.hpp"
|
|
|
|
struct Cow : public _cow_util::Span<unsigned char> {
|
|
struct Fake;
|
|
Cow() = delete;
|
|
|
|
Cow(size_t size);
|
|
Cow(Cow&& m);
|
|
virtual ~Cow();
|
|
|
|
virtual Fake clone() const;
|
|
|
|
inline void* area() override { return cow_ptr(get_raw()); }
|
|
inline const void* area() const override { return cow_ptr_of(const void, get_raw()); }
|
|
|
|
/// Get the size of the mapped area.
|
|
///
|
|
/// Note: This calls into `_inner`'s internals. To skip the call on non-LTO builds, use `size_unsafe()`.
|
|
size_t size() const override;
|
|
/// Get the size by assuming the ABI layout of cow_t to be correct. Potentially faster but ABI sensitive.
|
|
/// This shouldn't be a problem if all build static assertions passed.
|
|
///
|
|
/// Note: This behaviour can be diabled by building with `-DCOW_NO_ASSUME_ABI`. In this case, this function calls out to the C API to determine the size.
|
|
/// There is also likely no benefit using this over `size()` in LTO enabled builds.
|
|
///
|
|
/// XXX: Deprecated function for now. It seems `size()` offers better codegen on LTO and non-LTO enabled builds.
|
|
[[deprecated("size() is safer and offers better codegen.")]] inline size_t size_unsafe() const { return _cow_size_unsafe(get_raw()); }
|
|
|
|
static Cow from_raw(cow_t* owned);
|
|
|
|
private:
|
|
struct _inner;
|
|
Cow(cow_t* raw);
|
|
|
|
protected:
|
|
Cow(const Cow& c);
|
|
const std::shared_ptr<_inner> super;
|
|
virtual cow_t* get_raw() const;
|
|
|
|
};
|
|
|
|
struct Cow::Fake : public Cow {
|
|
Fake() = delete;
|
|
Fake(const Cow& real);
|
|
Fake(const Fake& copy);
|
|
Fake(Fake&& move);
|
|
~Fake();
|
|
|
|
Fake clone() const override;
|
|
|
|
static Fake from_real(const Cow& real);
|
|
|
|
protected:
|
|
cow_t* get_raw() const override;
|
|
private:
|
|
|
|
cow_t* const fake;
|
|
};
|