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#pragma once
#include <util/system/yassert.h>
#include <util/system/defaults.h>
#include <util/generic/typetraits.h>
namespace NUnicodeTable {
template <class Value>
struct TValueSelector;
template <class Value>
struct TValueSelector {
using TStored = const Value;
using TValueRef = const Value&;
using TValuePtr = const Value*;
static inline TValueRef Get(TValuePtr val) {
return *val;
}
};
template <class Value>
struct TValueSelector<const Value*> {
using TStored = const Value[];
using TValueRef = const Value*;
using TValuePtr = const Value*;
static inline TValueRef Get(TValuePtr val) {
return val;
}
};
template <class Value>
struct TValues {
using TSelector = TValueSelector<Value>;
using TStored = typename TSelector::TStored;
using TValueRef = typename TSelector::TValueRef;
using TValuePtr = typename TSelector::TValuePtr;
using TData = const TValuePtr*;
static inline TValuePtr Get(TData table, size_t index) {
static_assert(std::is_pointer<TData>::value, "expect std::is_pointer<TData>::value");
return table[index];
}
static inline TValueRef Get(TValuePtr val) {
return TSelector::Get(val);
}
};
template <int Shift, class TChild>
struct TSubtable {
using TStored = typename TChild::TStored;
using TValueRef = typename TChild::TValueRef;
using TValuePtr = typename TChild::TValuePtr;
using TData = const typename TChild::TData*;
static inline TValuePtr Get(TData table, size_t key) {
static_assert(std::is_pointer<TData>::value, "expect std::is_pointer<TData>::value");
return TChild::Get(table[key >> Shift], key & ((1 << Shift) - 1));
}
static inline TValueRef Get(TValuePtr val) {
return TChild::Get(val);
}
};
template <class T>
class TTable {
private:
using TImpl = T;
using TData = typename TImpl::TData;
const TData Data;
const size_t MSize;
public:
using TStored = typename TImpl::TStored;
using TValueRef = typename TImpl::TValueRef;
using TValuePtr = typename TImpl::TValuePtr;
private:
inline TValueRef GetImpl(size_t key) const {
TValuePtr val = TImpl::Get(Data, key);
return TImpl::Get(val);
}
inline TValueRef Get(size_t key) const {
return GetImpl(key);
}
public:
TTable(TData data, size_t size)
: Data(data)
, MSize(size)
{
static_assert(std::is_pointer<TData>::value, "expect std::is_pointer<TData>::value");
}
inline TValueRef Get(size_t key, TValueRef value) const {
if (key >= Size())
return value;
return GetImpl(key);
}
inline TValueRef Get(size_t key, size_t defaultKey) const {
if (key >= Size())
return Get(defaultKey);
return GetImpl(key);
}
inline size_t Size() const {
return MSize;
}
};
const size_t UNICODE_TABLE_SHIFT = 5;
} // namespace NUnicodeTable
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