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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/eval/eval/cell_type.h>
#include <vector>
namespace vespalib::eval::test {
/**
* Helper class used to span out the space describing the cell types
* of different values.
**/
class CellTypeSpace
{
private:
std::vector<CellType> _types;
std::vector<size_t> _state;
bool _drop_same;
bool _drop_different;
bool _done;
void step_state(); // will set _done
bool should_skip(); // will check _done
void skip_unwanted() {
while (should_skip()) {
step_state();
}
}
public:
CellTypeSpace(const std::vector<CellType> &types, size_t n)
: _types(types), _state(n, 0), _drop_same(false), _drop_different(false), _done(false)
{
assert(!types.empty());
assert(n > 0);
skip_unwanted();
}
CellTypeSpace(const CellTypeSpace& rhs) = default;
CellTypeSpace(CellTypeSpace&& rhs) noexcept = default;
~CellTypeSpace();
CellTypeSpace &same() {
_drop_different = true;
assert(!_drop_same);
skip_unwanted();
return *this;
}
CellTypeSpace &different() {
_drop_same = true;
assert(!_drop_different);
skip_unwanted();
return *this;
}
size_t n() const { return _state.size(); }
bool valid() const { return !_done; }
void next() {
assert(valid());
step_state();
skip_unwanted();
}
std::vector<CellType> get() const {
assert(valid());
std::vector<CellType> ret;
for (size_t idx: _state) {
ret.push_back(_types[idx]);
}
return ret;
}
};
} // namespace
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