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337 rader
7.5 KiB
337 rader
7.5 KiB
#pragma once
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#include "gp/exception.hpp"
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#include "gp/algorithm/tmp_manip.hpp"
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#include "gp/algorithm/move.hpp"
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#include "gp/algorithm/modifiers.hpp"
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namespace gp{
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template <typename fn, typename allocator, bool copy_allocator = false>
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class function;
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template <typename ret, typename allocator, bool copy_allocator, typename ...args>
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class function<ret(args...), allocator, copy_allocator>{
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using fn_ptr = char*;
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using invoke_fn_t = ret (*)(fn_ptr, args&&...);
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using condestruct_fn_t = void (*) (fn_ptr, fn_ptr);
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using allocator_t = typename gp::either<
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copy_allocator,
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allocator,
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gp::reference_wrapper<allocator>
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>::type;
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allocator_t alloc;
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invoke_fn_t invokator;
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condestruct_fn_t condestructor;
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fn_ptr data_ptr;
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size_t data_size;
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template<typename func>
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static ret invoke(func* fn, args&&... fw_args) {
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return (*fn)(gp::forward<args>(fw_args)...);
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}
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template<typename func>
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static void condestruct(func* dest, func* src) {
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if(dest != nullptr) {
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new (dest) func(*src);
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} else {
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src->~func();
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}
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}
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static void nop_condestruct(char*, char*) {
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return;
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}
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public:
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wnull-dereference"
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#pragma gcc diagnostic push
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#pragma gcc diagnostic ignored "-Wnull-dereference"
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function(allocator_t alloc_v = gp::reference_wrapper<allocator_t>{*reinterpret_cast<allocator_t*>(0)})
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#pragma gcc pop
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#pragma clang pop
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: alloc(alloc_v)
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, invokator(nullptr)
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, condestructor(nullptr)
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, data_ptr(nullptr)
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, data_size(0)
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{}
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template<typename func>
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function(func f, allocator_t alloc_v)
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: alloc(alloc_v)
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, invokator(reinterpret_cast<invoke_fn_t>(invoke<func>))
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, condestructor(reinterpret_cast<condestruct_fn_t>(condestruct<func>))
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, data_ptr((char*)((allocator&)alloc).allocate(sizeof(func)))
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, data_size(sizeof(func))
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{
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gp_config::assertion(data_ptr != nullptr, "allocator failed in function");
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if(data_ptr != nullptr) this->condestructor(data_ptr, reinterpret_cast<char*>(&f));
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}
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function(function const& rhs)
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: alloc(rhs.alloc)
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, invokator(rhs.invokator)
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, condestructor(rhs.condestructor)
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, data_ptr(rhs.data_size != 0 ? (char*)((allocator&)alloc).allocate(rhs.data_size) : nullptr)
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, data_size(rhs.data_size)
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{
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gp_config::assertion(data_ptr != nullptr, "allocator failed in function");
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if(
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data_ptr != nullptr
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and rhs.data_ptr != nullptr
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) this->condestructor(data_ptr, rhs.data_ptr);
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}
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function(function&& rhs)
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: alloc(rhs.alloc)
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, invokator(rhs.invokator)
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, condestructor(rhs.condestructor)
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, data_ptr(rhs.data_ptr)
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, data_size(rhs.data_size)
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{
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rhs.data_ptr = nullptr;
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}
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constexpr function(ret(*fn)(args...), allocator_t alloc_v = allocator_t{})
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: alloc(alloc_v)
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, invokator(reinterpret_cast<invoke_fn_t>(invoke<ret(args...)>))
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, condestructor(nop_condestruct)
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, data_ptr(reinterpret_cast<char*>(fn))
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, data_size(0)
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{}
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~function(){
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if(data_size == 0) {
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return;
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}
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if(data_ptr != nullptr) {
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condestructor(nullptr, data_ptr);
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((allocator&)alloc).deallocate(data_ptr);
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data_ptr = nullptr;
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}
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}
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function& operator=(function&& rhs) {
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gp::swap(alloc, rhs.alloc);
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gp::swap(invokator, rhs.invokator);
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gp::swap(condestructor, rhs.condestructor);
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gp::swap(data_ptr,rhs.data_ptr);
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gp::swap(data_size,rhs.data_size);
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return *this;
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}
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ret operator()(args&&... argv) {
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return invokator(data_ptr, gp::forward<args>(argv)...);
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}
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};
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/*template <typename ret, typename ...args>
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class function<ret(args...)>{
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struct virtual_callable
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{
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virtual void inplace_move(char*) = 0;
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virtual virtual_callable* all_copy() = 0;
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virtual void inplace_copy(char*) = 0;
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virtual virtual_callable* all_move() = 0;
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virtual ~virtual_callable() = default;
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virtual ret operator() (args...) = 0;
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};
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template<typename fn>
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class callable final : public virtual_callable{
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typename gp::remove_reference<fn>::type internal_representation;
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public:
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callable(const fn func)
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: internal_representation{gp::move(func)}
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{}
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callable(callable&) = default;
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callable(callable&&) = default;
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virtual ~callable() override = default;
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virtual void inplace_copy(char* ptr) override {
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new(ptr) callable(*this);
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}
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virtual virtual_callable* all_copy() override {
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return new callable(*this);
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}
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virtual void inplace_move(char* ptr) override {
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new(ptr) callable(gp::move(*this));
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}
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virtual virtual_callable* all_move() override {
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return new callable(gp::move(*this));
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}
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ret operator() (args... arg_list) override
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{
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return internal_representation(arg_list...);
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}
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};
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// tweak a way to store a size in there for trivial copy
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enum state_t : uint8_t{
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INACTIVE = 0,
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ACTIVE = 1,
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NO_SOO = 0,
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SOO = 2
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};
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state_t state{};
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union{
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virtual_callable* functor = nullptr;
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char inplace[16];
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} self;
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public:
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template <typename T>
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function& operator=(T& t)
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{
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if(state & ACTIVE)
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{
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if(state & SOO)
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{
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((virtual_callable*)self.inplace)->~virtual_callable();
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}
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else
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{
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delete self.functor;
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}
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}
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if(!(t.state & ACTIVE))
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{
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state = INACTIVE;
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return;
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}
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if constexpr (!std::is_same_v<T, function<ret(args...)>>) {
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if constexpr (sizeof(callable<T>) <= sizeof(self))
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{
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new((void*)self.inplace) callable<T>(t);
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = new callable<T>(t);
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state = (state_t)(ACTIVE | NO_SOO);
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}
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} else {
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if(t.state & SOO)
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{
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auto& ref = t.self.functor;
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ref->inplace_copy((char*)&self);
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = t.self.functor->all_copy();
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state = (state_t)(ACTIVE | NO_SOO);
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}
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}
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}
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function()
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{
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state = INACTIVE;
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}
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template<typename T>
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function<>(T& t)
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{
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if constexpr (!std::is_same_v<T, function<ret(args...)>>) {
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if constexpr (sizeof(callable<T>) <= sizeof(self))
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{
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new((void*)self.inplace) callable<T>(t);
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = new callable<T>(t);
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state = (state_t)(ACTIVE | NO_SOO);
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}
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} else {
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if(t.state & SOO)
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{
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t.self.functor->inplace_copy(self.inplace);
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = t.self.functor->all_copy();
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state = (state_t)(ACTIVE | NO_SOO);
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}
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}
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}
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template <typename T>
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function(T&& t)
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{
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if constexpr (!std::is_same_v<T, function<ret(args...)>>) {
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if constexpr (sizeof(callable<T>) <= sizeof(self))
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{
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new((void*)self.inplace) callable<T>(gp::move(t));
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = new callable<T>(gp::move(t));
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state = (state_t)(ACTIVE | NO_SOO);
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}
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} else {
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if(t.state & SOO)
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{
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auto& ref = t.self.functor;
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ref->inplace_move((char*)&self);
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state = (state_t)(ACTIVE | SOO);
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}
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else
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{
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self.functor = t.self.functor->all_move();
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state = (state_t)(ACTIVE | NO_SOO);
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}
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}
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}
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ret operator()(args... arg_list) const {
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if constexpr (gp_config::has_exceptions)
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{
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if(!(state & ACTIVE))
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{
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throw bad_functor{};
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}
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}
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if(state & SOO)
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{
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return (*(virtual_callable*)&self)(arg_list...);
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}
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else
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{
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return (*self.functor)(arg_list...);
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}
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}
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~function()
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{
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if(state & ACTIVE)
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{
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if(state & SOO)
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{
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((virtual_callable*)&self)->~virtual_callable();
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}
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else
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{
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delete self.functor;
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}
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}
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}
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};*/
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}
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