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417 righe
9.4 KiB
417 righe
9.4 KiB
#pragma once
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#include "gp/exception.hpp"
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#include "gp/functional/bind_front.hpp"
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#include "gp/algorithms/move.hpp"
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#include "gp/algorithms/tmp_manip.hpp"
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#include "gp/utils/allocators/allocator.hpp"
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#include "gp/functional/optional.hpp"
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namespace gp{
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namespace details {
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template<typename pred, typename returner>
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auto ensure(pred a, returner b) {
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gp_config::assertion(a(), "could not ensure predicate");
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return b();
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}
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}
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template <typename fn>
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class function;
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template <typename ret, typename ...args>
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class function<ret(args...)>{
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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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gp::optional<gp::reference_wrapper<allocator>> 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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function(allocator& alloc_v)
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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& 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(
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sizeof(func) <= sizeof(data_ptr)
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? nullptr
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: details::ensure(
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[&](){return alloc.has_value();},
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[&](){return (char*)(alloc.value().get().allocate(sizeof(func)));}
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)
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)
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, data_size(
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sizeof(func)
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)
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{
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gp_config::assertion(data_size <= sizeof(func) || !(alloc.has_value() && data_ptr == nullptr), "allocator failed in function");
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this->condestructor(data_size <= sizeof(data_ptr) ? (char*)&data_ptr : data_ptr, reinterpret_cast<char*>(&f));
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}
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/*function(ret f_ptr(args...))
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: function(f_ptr, nullopt)
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{}*/
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template<typename func>
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function(func f, nullopt_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()
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, data_size(
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details::ensure(
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[&](){return sizeof(func) <= sizeof(data_ptr);},
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[&](){return sizeof(func);}
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)
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)
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{
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this->condestructor((char*)&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(
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rhs.data_size <= sizeof(data_ptr)
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? 0
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: details::ensure(
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[&](){return alloc.has_value();},
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[&](){return (char*)(alloc.value().get().allocate(rhs.data_size));}
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)
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)
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, data_size(rhs.data_size)
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{
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gp_config::assertion(data_size <= sizeof(data_ptr) || !(alloc.has_value() && data_ptr == nullptr), "allocator failed in function");
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if(
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data_size != 0
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and rhs.data_size != 0
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) this->condestructor(
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data_size <= sizeof(data_ptr) ? (char*)&data_ptr : data_ptr,
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data_size <= sizeof(data_ptr) ? (char*)&(rhs.data_ptr) : rhs.data_ptr
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);
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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_size <= sizeof(data_ptr) ? nullptr : rhs.data_ptr)
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, data_size(rhs.data_size)
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{
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if(data_size != 0 && data_size <= sizeof(data_ptr)) {
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condestructor((char*)&data_ptr, (char*)&rhs.data_ptr);
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condestructor(nullptr, (char*)&rhs.data_ptr);
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}
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rhs.data_ptr = nullptr;
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rhs.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 && alloc.has_value()) {
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condestructor(nullptr, data_ptr);
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alloc.value().get().deallocate(data_ptr);
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data_ptr = nullptr;
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}
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if(data_size < sizeof(data_ptr))
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{
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condestructor(nullptr, (char*)&data_ptr);
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}
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}
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function& operator=(function&& rhs) {
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swap(alloc, rhs.alloc);
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swap(invokator, rhs.invokator);
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swap(condestructor, rhs.condestructor);
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swap(data_ptr,rhs.data_ptr);
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swap(data_size,rhs.data_size);
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return *this;
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}
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function& operator=(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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/* Cleanup */
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if(data_size > sizeof(data_ptr)) {
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condestructor(nullptr, data_ptr);
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alloc.value().get().deallocate(data_ptr);
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} else if(data_size) {
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condestructor(nullptr, (char*)&data_ptr);
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}
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/* Reallocation */
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data_size = rhs.data_size;
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data_ptr = data_size <= sizeof(data_ptr)
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? 0
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: details::ensure(
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[&](){return alloc.has_value();},
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[&](){return (char*)(alloc.value().get().allocate(rhs.data_size));}
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);
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gp_config::assertion(!(alloc.has_value() && data_size > 8 && data_ptr != nullptr), "allocator failed in function");
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if(
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data_size > 0
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) this->condestructor(
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data_size <= sizeof(data_ptr) ? (char*)&data_ptr : data_ptr,
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data_size <= sizeof(data_ptr) ? (char*)&rhs.data_ptr : rhs.data_ptr
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);
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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_size <= sizeof(data_ptr) ? (fn_ptr)&data_ptr : data_ptr, gp::forward<args>(argv)...);
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}
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bool ready() {
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return invokator != nullptr;
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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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