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#ifndef CAST_INL_H_
#error "Direct inclusion of this file is not allowed, include cast.h"
// For the sake of sane code completion.
#include "cast.h"
#endif
#include "enum.h"
#include <util/string/cast.h>
#include <util/string/printf.h>
#include <type_traits>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
namespace NDetail {
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
requires std::is_signed_v<T> && std::is_signed_v<S>
{
return value >= std::numeric_limits<T>::lowest() && value <= std::numeric_limits<T>::max();
}
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
requires std::is_signed_v<T> && std::is_unsigned_v<S>
{
return value <= static_cast<typename std::make_unsigned<T>::type>(std::numeric_limits<T>::max());
}
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
requires std::is_unsigned_v<T> && std::is_signed_v<S>
{
return value >= 0 && static_cast<typename std::make_unsigned<S>::type>(value) <= std::numeric_limits<T>::max();
}
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
requires std::is_unsigned_v<T> && std::is_unsigned_v<S>
{
return value <= std::numeric_limits<T>::max();
}
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
requires std::is_enum_v<S>
{
return IsInIntegralRange<T>(static_cast<std::underlying_type_t<S>>(value));
}
template <class T>
TString FormatInvalidCastValue(T value)
{
return ::ToString(value);
}
inline TString FormatInvalidCastValue(signed char value)
{
return TString("'") + value + TString("'");
}
inline TString FormatInvalidCastValue(unsigned char value)
{
return TString("'") + value + TString("'");
}
#ifdef __cpp_char8_t
inline TString FormatInvalidCastValue(char8_t value)
{
return FormatInvalidCastValue(static_cast<unsigned char>(value));
}
#endif
} // namespace NDetail
////////////////////////////////////////////////////////////////////////////////
template <class T, class S>
constexpr bool CanFitSubtype()
{
return NDetail::IsInIntegralRange<T>(std::numeric_limits<S>::min()) &&
NDetail::IsInIntegralRange<T>(std::numeric_limits<S>::max());
}
template <class T, class S>
constexpr bool IsInIntegralRange(S value)
{
return NDetail::IsInIntegralRange<T>(value);
}
template <class T, class S>
constexpr std::optional<T> TryCheckedIntegralCast(S value)
{
[[unlikely]] if (!NDetail::IsInIntegralRange<T>(value)) {
return std::nullopt;
}
return static_cast<T>(value);
}
template <class T, class S>
T CheckedIntegralCast(S value)
{
auto result = TryCheckedIntegralCast<T>(value);
if (!result) {
throw TSimpleException(Sprintf("Error casting %s value \"%s\" to %s: value is out of expected range [%s; %s]",
TypeName<S>().c_str(),
NYT::NDetail::FormatInvalidCastValue(value).c_str(),
TypeName<T>().c_str(),
::ToString(std::numeric_limits<T>::lowest()).c_str(),
::ToString(std::numeric_limits<T>::max()).c_str()));
}
return *result;
}
template <class T, class S>
requires TEnumTraits<T>::IsEnum
constexpr std::optional<T> TryCheckedEnumCast(S value, bool enableUnknown)
{
auto underlying = TryCheckedIntegralCast<std::underlying_type_t<T>>(value);
[[unlikely]] if (!underlying) {
return std::nullopt;
}
auto candidate = static_cast<T>(*underlying);
[[unlikely]] if (!TEnumTraits<T>::IsValidValue(candidate)) {
if (enableUnknown) {
if constexpr (constexpr auto optionalUnknownValue = TEnumTraits<T>::TryGetUnknownValue()) {
if constexpr (TEnumTraits<T>::IsBitEnum) {
return static_cast<T>(*underlying & ToUnderlying(TEnumTraits<T>::GetAllSetValue())) | *optionalUnknownValue;
} else {
return *optionalUnknownValue;
}
}
}
return std::nullopt;
}
return candidate;
}
template <class T, class S>
requires TEnumTraits<T>::IsEnum
T CheckedEnumCast(S value)
{
auto result = TryCheckedEnumCast<T>(value, /*enableUnknown*/ true);
[[unlikely]] if (!result) {
if constexpr (std::is_signed_v<S>) {
throw TSimpleException(Sprintf("Error casting %s value \"%" PRIi64 "\" to enum %s",
TypeName<S>().c_str(),
static_cast<i64>(value),
TEnumTraits<T>::GetTypeName().data()));
} else {
throw TSimpleException(Sprintf("Error casting %s value \"%" PRIu64 "\" to enum %s",
TypeName<S>().c_str(),
static_cast<ui64>(value),
TEnumTraits<T>::GetTypeName().data()));
}
}
return *result;
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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