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StrVec.cpp
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StrVec.cpp
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#include<string>
#include<memory>
#include<utility>
#include<algorithm>
#include<utility>
#include<iostream>
#include "StrVec.h"
std::allocator<std::string> StrVec::alloc;
void StrVec::push_back(const std::string &s)
{
chk_n_alloc();
alloc.construct(first_free++, s);
}
void StrVec::push_back(std::string &&s)
{
chk_n_alloc();
alloc.construct(first_free++, std::move(s));
}
std::pair<std::string *, std::string *> StrVec::alloc_n_copy(const std::string *b, const std::string *e)
{
std::string * data = alloc.allocate(e - b);
return {data, std::uninitialized_copy(b, e, data)};
}
void StrVec::free()
{
if(elements)
{
StrVec * th = this;
std::for_each(elements, first_free, [](std::string &s){ alloc.destroy(&s); } );
alloc.deallocate(elements, cap - elements);
}
}
StrVec::StrVec(const StrVec & s)
{
std::pair<std::string *, std::string *> newdata = alloc_n_copy(s.begin(), s.end());
elements = newdata.first;
first_free = cap = newdata.second;
}
StrVec::~StrVec()
{
free();
}
StrVec & StrVec::operator=(const StrVec & rhs)
{
std::pair<std::string *, std::string *> data = alloc_n_copy(rhs.begin(), rhs.end());
free();
elements = data.first;
first_free = cap = data.second;
return *this;
}
StrVec & StrVec::operator=(std::initializer_list<std::string> li)
{
std::pair<std::string *, std::string *> data = alloc_n_copy(li.begin(), li.end());
free();
elements = data.first;
first_free = cap = data.second;
return *this;
}
StrVec::StrVec(std::initializer_list<std::string> li)
{
std::pair<std::string *, std::string *> newdata = alloc_n_copy(li.begin(), li.end());
elements = newdata.first;
first_free = cap = newdata.second;
}
StrVec::StrVec(StrVec &&s) noexcept : elements(s.elements), first_free(s.first_free), cap(s.cap)
{
s.elements = s.first_free = s.cap = nullptr;
}
StrVec & StrVec::operator=(StrVec &&rhs) noexcept
{
if(this != &rhs)
{
free();
elements = rhs.elements;
first_free = rhs.first_free;
cap = rhs.cap;
rhs.elements = rhs.first_free = rhs.cap = nullptr;
}
return *this;
}
void StrVec::reallocate()
{
size_t newcapacity = size() ? 2 * size() : 1;
reserve(newcapacity);
}
void StrVec::reserve(size_t n)
{
if(n <= capacity())
return;
std::string * newdata = alloc.allocate(n);
std::string * dest = newdata;
std::string * elem = elements;
for(size_t i = 0; i != size(); ++i)
alloc.construct(dest++, std::move(*elem++));
free();
elements = newdata;
first_free = dest;
cap = elements + n;
}
void StrVec::resize(size_t n, const std::string &t)
{
if(n == size())
return;
if(n < size())
{
while(size() != n)
alloc.destroy(--first_free);
return;
}
if(n > capacity())
reserve(n);
while(size() != n)
alloc.construct(first_free++, t);
}
bool operator==(const StrVec &lhs, const StrVec &rhs)
{
if(lhs.size() != rhs.size())
return false;
for(const std::string *p1 = lhs.begin(), *p2 = rhs.begin(); p1 != lhs.end(); ++p1, ++p2)
if(*p1 != *p2)
return false;
return true;
}
bool operator!=(const StrVec &lhs, const StrVec &rhs)
{
return !(lhs == rhs);
}
bool operator<(const StrVec &lhs, const StrVec &rhs)
{
const std::string *p1 = lhs.begin(), *p2 = rhs.begin();
for( ; p1 != lhs.end() && p2 != rhs.end(); ++p1, ++p2)
{
if(*p1 < *p2)
return true;
if(*p1 > *p2)
return false;
}
if(p1 != lhs.end() && p2 == rhs.end())
return false;
if(p1 == lhs.end() && p2 != rhs.end())
return true;
return false;
}
bool operator<=(const StrVec &lhs, const StrVec &rhs)
{
return !(lhs > rhs);
}
bool operator>(const StrVec &lhs, const StrVec &rhs)
{
const std::string *p1 = lhs.begin(), *p2 = rhs.begin();
for( ; p1 != lhs.end() && p2 != rhs.end(); ++p1, ++p2)
{
if(*p1 > *p2)
return true;
if(*p1 < *p2)
return false;
}
if(p1 != lhs.end() && p2 == rhs.end())
return true;
if(p1 == lhs.end() && p2 != rhs.end())
return false;
return false;
}
bool operator>=(const StrVec &lhs, const StrVec &rhs)
{
return !(lhs < rhs);
}
std::string & StrVec::operator[](std::size_t n)
{
return elements[n];
}
const std::string & StrVec::operator[](std::size_t n) const
{
return elements[n];
}