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#pragma once
#include <typeinfo>
#include <util/generic/ptr.h>
#include <util/generic/cast.h>
#include <util/generic/string.h>
#include <util/generic/typetraits.h>
class IOutputStream;
namespace NConfig {
class IValue: public TAtomicRefCount<IValue> {
public:
virtual ~IValue() = default;
virtual bool IsA(const std::type_info& info) const = 0;
virtual TString TypeName() const = 0;
virtual void* Ptr() const = 0;
virtual ui64 AsUInt() const = 0;
virtual i64 AsInt() const = 0;
virtual double AsDouble() const = 0;
virtual bool AsBool() const = 0;
virtual TString AsString() const = 0;
virtual void ToJson(IOutputStream& out) const = 0;
};
namespace NCfgPrivate {
struct TDummy {
};
template <class T>
inline IValue* ConstructValueImpl(const T& t, ...) {
extern IValue* ConstructValueImpl(const T& t);
return ConstructValueImpl(t);
}
template <class T, std::enable_if_t<std::is_floating_point<T>::value>* = nullptr>
inline IValue* ConstructValueImpl(const T& t, TDummy) {
extern IValue* ConstructValueImpl(const double& t);
return ConstructValueImpl(t);
}
template <class T, std::enable_if_t<std::is_integral<T>::value>* = nullptr>
inline IValue* ConstructValueImpl(const T& t, TDummy) {
typedef std::conditional_t<std::is_signed<T>::value, i64, ui64> Type;
extern IValue* ConstructValueImpl(const Type& t);
return ConstructValueImpl(t);
}
template <class T, std::enable_if_t<std::is_convertible<T, TString>::value>* = nullptr>
inline IValue* ConstructValueImpl(const T& t, TDummy) {
extern IValue* ConstructValueImpl(const TString& t);
return ConstructValueImpl(t);
}
inline IValue* ConstructValueImpl(const bool& t, TDummy) {
extern IValue* ConstructValueImpl(const bool& t);
return ConstructValueImpl(t);
}
}
template <class T>
inline IValue* ConstructValue(const T& t) {
return NCfgPrivate::ConstructValueImpl(t, NCfgPrivate::TDummy());
}
IValue* Null();
namespace NCfgPrivate {
template <bool Unsigned>
struct TSelector {
static inline ui64 Cvt(const IValue* v) {
return v->AsUInt();
}
};
template <>
struct TSelector<false> {
static inline i64 Cvt(const IValue* v) {
return v->AsInt();
}
};
[[noreturn]] void ReportTypeMismatch(TStringBuf realType, TStringBuf expectedType);
}
template <class T>
inline T ValueAs(const IValue* val) {
typedef NCfgPrivate::TSelector<std::is_unsigned<T>::value> TCvt;
return SafeIntegerCast<T>(TCvt::Cvt(val));
}
template <>
inline double ValueAs(const IValue* val) {
return val->AsDouble();
}
template <>
inline float ValueAs(const IValue* val) {
return (float)val->AsDouble();
}
template <>
inline bool ValueAs(const IValue* val) {
return val->AsBool();
}
template <>
inline TString ValueAs(const IValue* val) {
return val->AsString();
}
}
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