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Copy pathsmallfun.hpp
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517 lines (443 loc) · 13.4 KB
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#ifndef SMALLFUNCTION_SMALLFUNCTION_HPP
#define SMALLFUNCTION_SMALLFUNCTION_HPP
#include <cinttypes>
#include <type_traits>
#include <utility>
#if defined(__has_feature)
#if __has_feature(address_sanitizer) || __has_feature(thread_sanitizer) || __has_feature(memory_sanitizer)
#define SMALLFUN_SIZE_MULTIPLIER 3
#endif
#endif
#if !defined(SMALLFUN_SIZE_MULTIPLIER)
#if __SANITIZE_ADDRESS__ || __SANITIZE_MEMORY__
#define SMALLFUN_SIZE_MULTIPLIER 3
#endif
#endif
#if !defined(SMALLFUN_SIZE_MULTIPLIER)
#define SMALLFUN_SIZE_MULTIPLIER 1
#endif
namespace smallfun
{
enum class Methods
{
Copy, Move, Both
};
constexpr std::size_t DefaultSize = 64;
constexpr std::size_t DefaultAlign = alignof(std::intptr_t) > alignof(double)
? alignof(std::intptr_t)
: alignof(double);
template<class Signature, std::size_t Size = DefaultSize, std::size_t Align = DefaultAlign, Methods methods = Methods::Both>
class function;
template<typename T>
struct not_function : std::true_type { };
template<class S, std::size_t Sz, std::size_t Al, Methods M>
struct not_function<function<S, Sz, Al, M>> : std::false_type { };
template<class R, class...Xs, std::size_t Size, std::size_t Align>
class function<R(Xs...), Size, Align, Methods::Copy>
{
using call_operator = R(*)(void* self, Xs...);
using copy_operator = void(*)(void* self, void*);
using dest_operator = void(*)(void* self);
call_operator vtbl_call{};
alignas(Align) char m_memory[Size * SMALLFUN_SIZE_MULTIPLIER];
copy_operator vtbl_copy;
dest_operator vtbl_dest;
public:
static constexpr std::size_t max_storage = Size * SMALLFUN_SIZE_MULTIPLIER;
static constexpr std::size_t alignment = Align;
function() noexcept = default;
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function(F&& f) noexcept(std::is_nothrow_move_constructible_v<std::decay_t<F>>)
{
using T = std::remove_cv_t<std::remove_reference_t<F>>;
static_assert(alignof(T) <= Align, "alignment must be increased");
static_assert(sizeof(T) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) T{std::forward<F>(f)};
vtbl_copy = [] (void* self, void* memory)
{
new (memory) T{*reinterpret_cast<T*>(self)};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<T*>(self))(xs...);
};
vtbl_dest = [] (void* self)
{
(*reinterpret_cast<T*>(self)).~T();
};
}
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(const function<S, Sz, Al, M>& sf) = delete;
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(function<S, Sz, Al, M>&& sf) = delete;
template<class R2, class...Xs2, std::size_t Sz, std::size_t Al, Methods M>
function(const function<R2(Xs2...), Sz, Al, M>& sf) = delete;
template<class R2, class...Xs2, std::size_t Sz, std::size_t Al, Methods M>
function(function<R2(Xs2...), Sz, Al, M>&& sf) = delete;
function(const function& sf)
: vtbl_call{sf.vtbl_call}
, vtbl_copy{sf.vtbl_copy}
, vtbl_dest{sf.vtbl_dest}
{
if(allocated())
sf.copy(m_memory);
}
function(function&& sf): function{sf} { }
function& operator=(const function& sf)
{
clean();
vtbl_call = sf.vtbl_call;
vtbl_copy = sf.vtbl_copy;
vtbl_dest = sf.vtbl_dest;
if(allocated())
sf.copy(m_memory);
return *this;
}
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function& operator=(F&& f) noexcept(std::is_nothrow_move_constructible_v<std::decay_t<F>>)
{
clean();
using T = std::remove_cv_t<std::remove_reference_t<F>>;
static_assert(alignof(T) <= Align, "alignment must be increased");
static_assert(sizeof(T) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) T{std::forward<F>(f)};
vtbl_copy = [] (void* self, void* memory)
{
new (memory) T{*reinterpret_cast<T*>(self)};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<T*>(self))(xs...);
};
vtbl_dest = [] (void* self) noexcept
{
(*reinterpret_cast<T*>(self)).~T();
};
return *this;
}
~function()
{
if (allocated())
{
destruct();
}
}
template<class...Ys>
R operator()(Ys&&...ys)
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
template<class...Ys>
R operator()(Ys&&...ys) const
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
operator bool() const noexcept { return bool(vtbl_call); }
bool allocated() const noexcept { return bool(vtbl_call); }
private:
void clean() noexcept
{
if (allocated())
{
destruct();
vtbl_call = nullptr;
}
}
void copy(void* data) const
{
if (allocated())
{
return vtbl_copy((void*)m_memory, data);
}
}
void destruct() noexcept
{
return vtbl_dest((void*)m_memory);
}
};
template<class R, class...Xs, std::size_t Size, std::size_t Align>
class function<R(Xs...), Size, Align, Methods::Move>
{
using call_operator = R(*)(void* self, Xs...);
using move_operator = void(*)(void* self, void*);
using dest_operator = void(*)(void* self);
call_operator vtbl_call{};
alignas(Align) char m_memory[Size * SMALLFUN_SIZE_MULTIPLIER];
move_operator vtbl_move;
dest_operator vtbl_dest;
public:
static constexpr std::size_t max_storage = Size * SMALLFUN_SIZE_MULTIPLIER;
static constexpr std::size_t alignment = Align;
function() noexcept = default;
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function(F&& f) noexcept
{
using T = std::remove_cv_t<std::remove_reference_t<F>>;
static_assert(std::is_nothrow_move_constructible_v<std::decay_t<F>>, "Move-only version expects noexcept");
static_assert(alignof(T) <= Align, "alignment must be increased");
static_assert(sizeof(T) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) T{std::forward<F>(f)};
vtbl_move = [] (void* self, void* memory) noexcept
{
new (memory) T{std::move(*reinterpret_cast<T*>(self))};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<F*>(self))(xs...);
};
vtbl_dest = [] (void* self) noexcept
{
(*reinterpret_cast<T*>(self)).~T();
};
}
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(const function<S, Sz, Al, M>& sf) = delete;
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(function<S, Sz, Al, M>&& sf) = delete;
function(function&& sf) noexcept
: vtbl_call{sf.vtbl_call}
, vtbl_move{sf.vtbl_move}
, vtbl_dest{sf.vtbl_dest}
{
if(allocated())
sf.move(m_memory);
}
function(const function&& sf) = delete;
function& operator=(const function& sf) = delete;
function& operator=(function&& sf) noexcept
{
clean();
vtbl_call = sf.vtbl_call;
vtbl_move = sf.vtbl_move;
vtbl_dest = sf.vtbl_dest;
if(allocated())
sf.move(m_memory);
return *this;
}
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function& operator=(F&& f) noexcept
{
clean();
using T = std::remove_cv_t<std::remove_reference_t<F>>;
static_assert(std::is_nothrow_move_constructible_v<std::decay_t<F>>, "Move-only version expects noexcept");
static_assert(alignof(T) <= Align, "alignment must be increased");
static_assert(sizeof(T) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) T{std::forward<F>(f)};
vtbl_move = [] (void* self, void* memory) noexcept
{
new (memory) T{std::move(*reinterpret_cast<T*>(self))};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<T*>(self))(xs...);
};
vtbl_dest = [] (void* self) noexcept
{
(*reinterpret_cast<T*>(self)).~T();
};
return *this;
}
~function()
{
if (allocated())
{
destruct();
}
}
template<class...Ys>
R operator()(Ys&&...ys)
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
template<class...Ys>
R operator()(Ys&&...ys) const
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
operator bool() const noexcept { return bool(vtbl_call); }
bool allocated() const noexcept { return bool(vtbl_call); }
private:
void clean() noexcept
{
if (allocated())
{
destruct();
vtbl_call = nullptr;
}
}
void move(void* data) noexcept
{
if (allocated())
{
vtbl_move((void*)m_memory, data);
destruct();
vtbl_call = nullptr;
}
}
void destruct() noexcept
{
return vtbl_dest((void*)m_memory);
}
};
template<class R, class...Xs, std::size_t Size, std::size_t Align>
class function<R(Xs...), Size, Align, Methods::Both>
{
using call_operator = R(*)(void* self, Xs...);
using copy_operator = void(*)(void* self, void*);
using move_operator = void(*)(void* self, void*);
using dest_operator = void(*)(void* self);
call_operator vtbl_call{};
alignas(Align) char m_memory[Size * SMALLFUN_SIZE_MULTIPLIER];
copy_operator vtbl_copy;
move_operator vtbl_move;
dest_operator vtbl_dest;
public:
static constexpr std::size_t max_storage = Size * SMALLFUN_SIZE_MULTIPLIER;
static constexpr std::size_t alignment = Align;
function() noexcept = default;
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function(F&& f) noexcept(std::is_nothrow_move_constructible_v<std::decay_t<F>>)
{
using NoRef = std::remove_reference_t<F>;
using NoCVRef = std::remove_cv_t<NoRef>;
static_assert(alignof(NoRef) <= Align, "alignment must be increased");
static_assert(sizeof(NoRef) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) NoCVRef{std::forward<F>(f)};
vtbl_copy = [] (void* self, void* memory)
{
new (memory) NoCVRef{*reinterpret_cast<NoCVRef*>(self)};
};
vtbl_move = [] (void* self, void* memory)
{
new (memory) NoCVRef{std::move(*reinterpret_cast<NoCVRef*>(self))};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<NoCVRef*>(self))(xs...);
};
vtbl_dest = [] (void* self) noexcept
{
(*reinterpret_cast<NoCVRef*>(self)).~NoCVRef();
};
}
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(const function<S, Sz, Al, M>& sf) = delete;
template<class S, std::size_t Sz, std::size_t Al, Methods M>
function(function<S, Sz, Al, M>&& sf) = delete;
function(const function& sf)
: vtbl_call{sf.vtbl_call}
, vtbl_copy{sf.vtbl_copy}
, vtbl_move{sf.vtbl_move}
, vtbl_dest{sf.vtbl_dest}
{
if(allocated())
sf.copy(m_memory);
}
function(function&& sf)
: vtbl_call{sf.vtbl_call}
, vtbl_copy{sf.vtbl_copy}
, vtbl_move{sf.vtbl_move}
, vtbl_dest{sf.vtbl_dest}
{
if(allocated())
sf.move(m_memory);
}
function& operator=(const function& sf)
{
clean();
vtbl_call = sf.vtbl_call;
vtbl_copy = sf.vtbl_copy;
vtbl_move = sf.vtbl_move;
vtbl_dest = sf.vtbl_dest;
if(allocated())
sf.copy(m_memory);
return *this;
}
function& operator=(function&& sf)
{
clean();
vtbl_call = sf.vtbl_call;
vtbl_copy = sf.vtbl_copy;
vtbl_move = sf.vtbl_move;
vtbl_dest = sf.vtbl_dest;
if(allocated())
sf.move(m_memory);
return *this;
}
template<class F, typename = std::enable_if_t<not_function<std::remove_cv_t<std::remove_reference_t<F>>>::value>>
function& operator=(F&& f) noexcept(std::is_nothrow_move_constructible_v<std::decay_t<F>>)
{
clean();
using T = std::remove_cv_t<std::remove_reference_t<F>>;
static_assert(alignof(T) <= Align, "alignment must be increased");
static_assert(sizeof(T) <= Size * SMALLFUN_SIZE_MULTIPLIER, "argument too large for SmallFun");
new (m_memory) T{std::forward<F>(f)};
vtbl_copy = [] (void* self, void* memory)
{
new (memory) T{*reinterpret_cast<T*>(self)};
};
vtbl_move = [] (void* self, void* memory)
{
new (memory) T{std::move(*reinterpret_cast<T*>(self))};
};
vtbl_call = [] (void* self, Xs... xs) -> R
{
return (*reinterpret_cast<T*>(self))(xs...);
};
vtbl_dest = [] (void* self) noexcept
{
(*reinterpret_cast<T*>(self)).~T();
};
return *this;
}
~function()
{
if (allocated())
{
destruct();
}
}
template<class...Ys>
R operator()(Ys&&...ys)
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
template<class...Ys>
R operator()(Ys&&...ys) const
{
return vtbl_call((void*)m_memory, std::forward<Ys>(ys)...);
}
operator bool() const noexcept { return bool(vtbl_call); }
bool allocated() const noexcept { return bool(vtbl_call); }
private:
void clean() noexcept
{
if (allocated())
{
destruct();
vtbl_call = nullptr;
}
}
void copy(void* data) const
{
if (allocated())
{
return vtbl_copy((void*)m_memory, data);
}
}
void move(void* data)
{
if (allocated())
{
vtbl_move((void*)m_memory, data);
destruct();
vtbl_call = nullptr;
}
}
void destruct() noexcept
{
return vtbl_dest((void*)m_memory);
}
};
}
#endif
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