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iterators

main
Brett 2024-10-01 17:56:23 -04:00
parent 2163baf57c
commit ec02eb8419
3 changed files with 61 additions and 50 deletions
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2
CMakeLists.txt
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@ -1,6 +1,6 @@
cmake_minimum_required(VERSION 3.20)
include(cmake/color.cmake)
set(BLT_VERSION 2.0.2)
set(BLT_VERSION 2.0.3)
set(BLT_TARGET BLT)

106
include/blt/iterator/common.h
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@ -122,32 +122,43 @@ namespace blt::iterator
{
return *this->iter;
}
// your_class& operator++()
// {
// return *this;
// }
//
// your_class& operator--()
// {
// return *this;
// }
//
// friend your_class operator+(const your_class& a, blt::ptrdiff_t n)
// {
// static_assert(std::is_same_v<iterator_category, std::random_access_iterator_tag>,
// "Iterator must allow random access");
// }
//
// friend your_class operator-(const your_class& a, blt::ptrdiff_t n)
// {
// static_assert(std::is_same_v<iterator_category, std::random_access_iterator_tag>,
// "Iterator must allow random access");
// }
};
template<typename Iter, typename Derived>
class deref_only_wrapper : public passthrough_wrapper<Iter, Derived, false>
{
public:
using passthrough_wrapper<Iter, Derived, false>::passthrough_wrapper;
deref_only_wrapper& operator++()
{
++this->iter;
return *this;
}
deref_only_wrapper& operator--()
{
--this->iter;
return *this;
}
deref_only_wrapper& operator+(blt::ptrdiff_t n)
{
static_assert(meta::is_random_access_iterator_v<Iter>, "Iterator must allow random access");
this->iter = this->iter + n;
return *this;
}
deref_only_wrapper& operator-(blt::ptrdiff_t n)
{
static_assert(meta::is_random_access_iterator_v<Iter>, "Iterator must allow random access");
this->iter = this->iter - n;
return *this;
}
};
template<typename Iter, typename Func>
class map_wrapper : public passthrough_wrapper<Iter, map_wrapper<Iter, Func>>
class map_wrapper : public deref_only_wrapper<Iter, map_wrapper<Iter, Func>>
{
public:
using iterator_category = typename std::iterator_traits<Iter>::iterator_category;
@ -156,42 +167,39 @@ namespace blt::iterator
using pointer = value_type;
using reference = value_type;
map_wrapper(Iter iter, Func func): passthrough_wrapper<Iter, map_wrapper<Iter, Func>>(std::move(iter)), func(std::move(func))
map_wrapper(Iter iter, Func func): deref_only_wrapper<Iter, map_wrapper<Iter, Func>>(std::move(iter)), func(std::move(func))
{}
reference operator*() const
{
return func(*this->iter);
}
map_wrapper& operator++()
{
++this->iter;
return *this;
}
map_wrapper& operator--()
{
--this->iter;
return *this;
}
friend map_wrapper operator+(const map_wrapper& a, blt::ptrdiff_t n)
{
static_assert(meta::is_random_access_iterator_v<Iter>, "Iterator must allow random access");
return {a.iter + n, a.func};
}
friend map_wrapper operator-(const map_wrapper& a, blt::ptrdiff_t n)
{
static_assert(meta::is_random_access_iterator_v<Iter>, "Iterator must allow random access");
return {a.iter - n, a.func};
}
private:
Func func;
};
template<typename Iter, typename Pred>
class filter_wrapper : public deref_only_wrapper<Iter, filter_wrapper<Iter, Pred>>
{
public:
using iterator_category = typename std::iterator_traits<Iter>::iterator_category;
using value_type = meta::deref_return_t<Iter>;
using difference_type = blt::ptrdiff_t;
using pointer = value_type;
using reference = value_type;
filter_wrapper(Iter iter, Pred func): deref_only_wrapper<Iter, filter_wrapper<Iter, Pred>>(std::move(iter)), func(std::move(func))
{}
reference operator*() const
{
return func(*this->iter);
}
private:
Pred func;
};
namespace impl
{
template<typename Derived>

3
include/blt/iterator/fwddecl.h
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@ -44,6 +44,9 @@ namespace blt
template<typename Iter, typename Func>
class map_wrapper;
template<typename Iter, typename Pred>
class filter_wrapper;
namespace impl
{
template<typename Derived>