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#pragma once
#include <utility>
#include <memory>
template<typename Kt>
struct Entity
{
Kt key_;
};
template<typename Kt, typename Ct>
struct cell: public Entity<Kt>, public Ct
{
cell(): cell{0} {}
template<typename ...TArgs>
cell(Kt const & key, TArgs&&... args): Entity<Kt>{key}, Ct{args...} {}
};
template<typename Kt, typename Ct>
class Field
{
using field_t = Field<Kt, Ct>;
using data_t = cell<Kt, Ct>;
using data_p = data_t*;
using cdata_t = const data_t;
using cdata_p = const data_t*;
using iterator = data_t*;
using const_iterator = const data_t*;
using component_t = Ct;
using key_t = Kt;
using Alloc_t = std::allocator<cell<Kt, Ct> >;
private:
data_p data_;
std::size_t size_;
std::size_t capacity_;
public:
Field(): data_{Alloc_t().allocate(20)}, size_{0}, capacity_{20}
{
}
Field(field_t const & cpy): size_{cpy.size_}, capacity_{cpy.capacity_}
{
std::size_t cpt {0};
for(const_iterator it { cpy.cbegin() }; it != cpy.cend(); ++it, ++cpt)
{
Alloc_t().construct(&data_[cpt], *it);
}
}
~Field()
{
if(!is_empty())
{
for(iterator it { &data_[0] }; it != &data_[size_]; ++it)
{
Alloc_t().destroy(it);
}
}
Alloc_t().deallocate(data_, capacity_);
}
inline iterator begin()
{
return &data_[0];
}
inline iterator end()
{
return &data_[size_];
}
inline const_iterator cbegin() const
{
return &data_[0];
}
inline const_iterator cend() const
{
return &data_[size_];
}
inline bool is_empty() const
{
return (size_ == 0);
}
inline std::size_t const & size()
{
return size_;
}
bool exist(key_t const & key) const
{
if(!is_empty())
{
for(const_iterator it {cbegin()}; it != cend(); ++it)
{
if(it->key_ == key)
{
return true;
}
}
}
return false;
}
std::size_t offsetOf(key_t const & key) const
{
if(!is_empty())
{
std::size_t cpt{0};
for(const_iterator it {cbegin()}; it != cend(); ++it, ++cpt)
{
if(it->key_ == key)
{
return cpt;
}
}
}
return -1;
}
field_t & reserve(std::size_t const & cap)
{
if(cap < capacity_)
{
return *this;
}
std::size_t cpt{0};
data_p buf_{ Alloc_t().allocate(cap) };
for(const_iterator it { cbegin() }; it != cend(); ++it, ++cpt)
{
Alloc_t().construct(&buf_[cpt], *it);
}
std::swap(data_, buf_);
for(iterator it { begin() }; it != end(); ++it)
{
Alloc_t().destroy(it);
}
Alloc_t().deallocate(buf_, capacity_);
capacity_ = cap;
return *this;
}
field_t & resize(std::size_t const & nSize)
{
if(nSize < size_)
{
for(iterator it {begin() + (nSize-1)} ; it != end(); ++it)
{
Alloc_t().destroy(it);
}
size_ = nSize;
}
return *this;
}
void remove(key_t const & key)
{
if(exist(key))
{
iterator itb { begin()+key };
iterator ite { end()-1 };
Alloc_t().destroy(itb);
Alloc_t().construct(itb, *ite);
Alloc_t().destroy(ite);
--size_;
}
}
field_t & push(data_t const & data)
{
if(!exist(data.key_))
{
if(++size_ >= capacity_)
{
reserve(capacity_ * 1.5f);
}
Alloc_t().construct(&data_[size_-1], data);
return *this;
}
data_[offsetOf(data.key_)] = data;
return *this;
}
template<typename ...TArgs>
inline field_t & push(key_t const & key, TArgs&&... args)
{
return push(data_t{key, args...});
}
inline data_t & get(std::size_t const & id)
{
return data_[id];
}
data_t const & operator[](key_t const & key)
{
for(iterator it { begin() }; it != end(); ++it)
{
if(it->key_ == key)
{
return *it;
}
}
if(++size_ >= capacity_)
{
reserve(capacity_ * 1.5f);
}
Alloc_t().construct(&data_[size_-1], data_t{key});
return data_[size_-1];
}
}; |
