memgraph/include/utils/iterator/iterator_accessor.hpp
Kruno Tomola Fabro 5a42e15c4a Alpha version of label indexes.
Squashed messages from 9 commits:

9.
Properties now uses PropertyFamily and contained classes.
Fetching,seting,clearing properties can be done with PropertyFamilyKey or PropertyTypeKey.
Hierarchy of newly added clases is:
Vertices -n-> PropertyFamily {name: String} <-1-n-> PropertyType {type: Property::Flags}
Edges -n-> PropertyFamily {name: String} <-1-n-> PropertyType {type: Property::Flags}

PropertyFamilyKey -> PropertyType
PropertyTypeKey -> PropertyType

PropertyType t0,t1;
let t0!=t1 be true
let t0.family==t1.family be true

then next is true
PropertyTypeKey{&t0}!=PropertyTypeKey{&t1}
PropertyFamilyKey{&t0}==PropertyFamilyKey{&t1}
PropertyFamilyKey{&t0}==PropertyTypeKey{&t1}
PropertyTypeKey{&t0}==PropertyFamilyKey{&t1}

8.
Intermedate commit.
Noticed that integration queries throw SEGFAULT.

7.
Defined interface for indexes.
Fixed three memory leaks.
Fixed integration_queries test which now passes.

6.
Commit which return Xorshift128plus to valid shape.

5.
Tmp commit.

4.
Label Index is compiling.

3.
tmp

2.
Vertex::Accessor now updates Label index.

1.
Applied changes for code review.
2016-08-18 15:34:36 +01:00

60 lines
1.4 KiB
C++

#pragma once
#include "utils/iterator/iterator_base.hpp"
#include "utils/option.hpp"
namespace iter
{
// Class which turns accessor int next() based iterator.
// T - type of return value
// I - iterator type gotten from accessor
// A - accessor type
template <class T, class I, class A>
class IteratorAccessor : public IteratorBase<T>
{
public:
IteratorAccessor() = delete;
IteratorAccessor(A &&acc)
: begin(std::move(acc.begin())), acc(std::forward<A>(acc))
{
}
// Iter(const Iter &other) = delete;
// Iter(Iter &&other) :
// begin(std::move(other.begin)),end(std::move(other.end)) {};
Option<T> next() final
{
if (begin != acc.end()) {
auto ret = Option<T>(&(*(begin.operator->())));
begin++;
return ret;
} else {
return Option<T>();
}
}
private:
I begin;
A acc;
};
// TODO: Join to make functions into one
template <class A>
auto make_iter(A &&acc)
{
// Compiler cant deduce types T and I. decltype are here to help with it.
return IteratorAccessor<decltype(&(*(acc.begin().operator->()))),
decltype(acc.begin()), A>(std::move(acc));
}
template <class A>
auto make_iter_ref(A &acc)
{
// Compiler cant deduce types T and I. decltype are here to help with it.
return IteratorAccessor<decltype(&(*(acc.begin().operator->()))),
decltype(acc.begin()), A &>(acc);
}
}