I have a sketch of my own array class and array comparison rule
CArray.h
template <typename T>
class CArray
{
public:
CArray();
virtual void setComparisonRule(IArrayComparisonRule<T>* comparisonRule);
private:
IArrayComparisonRule<T>* comparisonRule;
};
CArray.cpp
template <typename T>
void CArray<T>::setComparisonRule(IArrayComparisonRule<T>* comparisonRule)
{
this->comparisonRule = comparisonRule;
}
IArrayComparisonRule
template <typename T>
class IArrayComparisonRule
{
public:
virtual b1 isLeftEqualRight(const T* leftItem, const T* rightItem) = 0;
virtual b1 isLeftLessThenRight(const T* leftItem, const T* rightItem) = 0;
virtual b1 isLeftGraterThenRight(const T* leftItem, const T* rightItem) = 0;
virtual b1 isLeftLessOrEqualThenRight(const T* leftItem, const T* rightItem) = 0;
virtual b1 isLeftGraterOrEqualThenRight(const T* leftItem, const T* rightItem) = 0;
};
Array element
class Sample
{
public:
si32 value;
Sample(si32 value = 0)
: value{value}
{}
~Sample()
{}
};
IArrayComparisonRule implementation
class SampleComparisonRule : public IArrayComparisonRule<Sample>
{
public:
b1 isLeftEqualRight(const Sample* leftItem, const Sample* rightItem)
{
return leftItem->value == rightItem->value;
}
b1 isLeftLessThenRight(const Sample* leftItem, const Sample* rightItem)
{
return leftItem->value < rightItem->value;
}
b1 isLeftGraterThenRight(const Sample* leftItem, const Sample* rightItem)
{
return leftItem->value > rightItem->value;
}
b1 isLeftLessOrEqualThenRight(const Sample* leftItem, const Sample* rightItem)
{
return leftItem->value <= rightItem->value;
}
b1 isLeftGraterOrEqualThenRight(const Sample* leftItem, const Sample* rightItem)
{
return leftItem->value >= rightItem->value;
}
};
main.cpp
CArray<Sample*> objects;
objects.setComparisonRule(new SampleComparisonRule());
As you can see I use T as template for both CArray and IArrayComparisonRule.
The compiler (GCC 5.4.0) error is no matching function for call to ‘ee::CArray::setComparisonRule(SampleComparisonRule*)’
When I pass Sample as a pointer to template:
class SampleComparisonRule : public IArrayComparisonRule<Sample*>
template <typename T*>
class IArrayComparisonRule
the compiler says: expected nested-name-specifier before ‘T’
From my point of view, the problem can be solved if I pass Sample as pointer to IArrayComparisonRule. How can I do that? Maybe there is another way to solve the problem.
