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https://github.com/Icinga/icinga2.git
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3e9292a349
The move `String(Value&&)` constructor tries to partially move `String` values from a `Value` type. However, since there was no an appropriate `Value::Get<T>()` implementation that binds to the requested move operation, the compiler will actually not move the value but copy it instead as the only available implementation of `Value::Get<T>()` returns a const reference `const T&`. This commit adds a new overload that returns a non-const reference and allows to optionally move the string value of a Value type.
262 lines
7.0 KiB
C++
262 lines
7.0 KiB
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
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#ifndef VALUE_H
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#define VALUE_H
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#include "base/object.hpp"
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#include "base/string.hpp"
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#include <boost/variant/variant.hpp>
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#include <boost/variant/get.hpp>
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#include <boost/throw_exception.hpp>
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namespace icinga
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{
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typedef double Timestamp;
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/**
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* The type of a Value.
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*
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* @ingroup base
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*/
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enum ValueType
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{
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ValueEmpty = 0,
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ValueNumber = 1,
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ValueBoolean = 2,
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ValueString = 3,
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ValueObject = 4
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};
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/**
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* A type that can hold an arbitrary value.
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*
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* @ingroup base
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*/
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class Value
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{
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public:
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Value() = default;
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Value(std::nullptr_t);
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Value(int value);
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Value(unsigned int value);
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Value(long value);
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Value(unsigned long value);
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Value(long long value);
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Value(unsigned long long value);
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Value(double value);
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Value(bool value);
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Value(const String& value);
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Value(String&& value);
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Value(const char *value);
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Value(const Value& other);
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Value(Value&& other);
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Value(Object *value);
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Value(const intrusive_ptr<Object>& value);
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template<typename T>
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Value(const intrusive_ptr<T>& value)
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: Value(static_pointer_cast<Object>(value))
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{
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static_assert(!std::is_same<T, Object>::value, "T must not be Object");
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}
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bool ToBool() const;
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operator double() const;
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operator String() const;
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Value& operator=(const Value& other);
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Value& operator=(Value&& other);
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bool operator==(bool rhs) const;
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bool operator!=(bool rhs) const;
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bool operator==(int rhs) const;
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bool operator!=(int rhs) const;
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bool operator==(double rhs) const;
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bool operator!=(double rhs) const;
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bool operator==(const char *rhs) const;
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bool operator!=(const char *rhs) const;
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bool operator==(const String& rhs) const;
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bool operator!=(const String& rhs) const;
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bool operator==(const Value& rhs) const;
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bool operator!=(const Value& rhs) const;
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template<typename T>
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operator intrusive_ptr<T>() const
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{
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if (IsEmpty() && !IsString())
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return intrusive_ptr<T>();
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if (!IsObject())
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BOOST_THROW_EXCEPTION(std::runtime_error("Cannot convert value of type '" + GetTypeName() + "' to an object."));
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const auto& object = Get<Object::Ptr>();
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ASSERT(object);
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intrusive_ptr<T> tobject = dynamic_pointer_cast<T>(object);
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if (!tobject)
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BOOST_THROW_EXCEPTION(std::bad_cast());
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return tobject;
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}
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bool IsEmpty() const;
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bool IsScalar() const;
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bool IsNumber() const;
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bool IsBoolean() const;
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bool IsString() const;
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bool IsObject() const;
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template<typename T>
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bool IsObjectType() const
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{
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if (!IsObject())
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return false;
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return dynamic_cast<T *>(Get<Object::Ptr>().get());
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}
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ValueType GetType() const;
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void Swap(Value& other);
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String GetTypeName() const;
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Type::Ptr GetReflectionType() const;
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Value Clone() const;
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template<typename T>
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const T& Get() const
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{
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return boost::get<T>(m_Value);
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}
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template<typename T>
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T& Get()
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{
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return boost::get<T>(m_Value);
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}
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private:
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boost::variant<boost::blank, double, bool, String, Object::Ptr> m_Value;
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};
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extern template const double& Value::Get<double>() const;
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extern template double& Value::Get<double>();
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extern template const bool& Value::Get<bool>() const;
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extern template bool& Value::Get<bool>();
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extern template const String& Value::Get<String>() const;
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extern template String& Value::Get<String>();
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extern template const Object::Ptr& Value::Get<Object::Ptr>() const;
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extern template Object::Ptr& Value::Get<Object::Ptr>();
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extern const Value Empty;
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Value operator+(const Value& lhs, const char *rhs);
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Value operator+(const char *lhs, const Value& rhs);
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Value operator+(const Value& lhs, const String& rhs);
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Value operator+(const String& lhs, const Value& rhs);
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Value operator+(const Value& lhs, const Value& rhs);
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Value operator+(const Value& lhs, double rhs);
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Value operator+(double lhs, const Value& rhs);
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Value operator+(const Value& lhs, int rhs);
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Value operator+(int lhs, const Value& rhs);
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Value operator-(const Value& lhs, const Value& rhs);
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Value operator-(const Value& lhs, double rhs);
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Value operator-(double lhs, const Value& rhs);
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Value operator-(const Value& lhs, int rhs);
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Value operator-(int lhs, const Value& rhs);
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Value operator*(const Value& lhs, const Value& rhs);
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Value operator*(const Value& lhs, double rhs);
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Value operator*(double lhs, const Value& rhs);
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Value operator*(const Value& lhs, int rhs);
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Value operator*(int lhs, const Value& rhs);
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Value operator/(const Value& lhs, const Value& rhs);
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Value operator/(const Value& lhs, double rhs);
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Value operator/(double lhs, const Value& rhs);
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Value operator/(const Value& lhs, int rhs);
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Value operator/(int lhs, const Value& rhs);
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Value operator%(const Value& lhs, const Value& rhs);
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Value operator%(const Value& lhs, double rhs);
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Value operator%(double lhs, const Value& rhs);
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Value operator%(const Value& lhs, int rhs);
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Value operator%(int lhs, const Value& rhs);
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Value operator^(const Value& lhs, const Value& rhs);
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Value operator^(const Value& lhs, double rhs);
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Value operator^(double lhs, const Value& rhs);
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Value operator^(const Value& lhs, int rhs);
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Value operator^(int lhs, const Value& rhs);
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Value operator&(const Value& lhs, const Value& rhs);
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Value operator&(const Value& lhs, double rhs);
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Value operator&(double lhs, const Value& rhs);
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Value operator&(const Value& lhs, int rhs);
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Value operator&(int lhs, const Value& rhs);
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Value operator|(const Value& lhs, const Value& rhs);
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Value operator|(const Value& lhs, double rhs);
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Value operator|(double lhs, const Value& rhs);
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Value operator|(const Value& lhs, int rhs);
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Value operator|(int lhs, const Value& rhs);
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Value operator<<(const Value& lhs, const Value& rhs);
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Value operator<<(const Value& lhs, double rhs);
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Value operator<<(double lhs, const Value& rhs);
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Value operator<<(const Value& lhs, int rhs);
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Value operator<<(int lhs, const Value& rhs);
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Value operator>>(const Value& lhs, const Value& rhs);
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Value operator>>(const Value& lhs, double rhs);
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Value operator>>(double lhs, const Value& rhs);
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Value operator>>(const Value& lhs, int rhs);
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Value operator>>(int lhs, const Value& rhs);
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bool operator<(const Value& lhs, const Value& rhs);
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bool operator<(const Value& lhs, double rhs);
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bool operator<(double lhs, const Value& rhs);
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bool operator<(const Value& lhs, int rhs);
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bool operator<(int lhs, const Value& rhs);
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bool operator>(const Value& lhs, const Value& rhs);
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bool operator>(const Value& lhs, double rhs);
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bool operator>(double lhs, const Value& rhs);
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bool operator>(const Value& lhs, int rhs);
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bool operator>(int lhs, const Value& rhs);
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bool operator<=(const Value& lhs, const Value& rhs);
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bool operator<=(const Value& lhs, double rhs);
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bool operator<=(double lhs, const Value& rhs);
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bool operator<=(const Value& lhs, int rhs);
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bool operator<=(int lhs, const Value& rhs);
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bool operator>=(const Value& lhs, const Value& rhs);
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bool operator>=(const Value& lhs, double rhs);
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bool operator>=(double lhs, const Value& rhs);
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bool operator>=(const Value& lhs, int rhs);
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bool operator>=(int lhs, const Value& rhs);
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std::ostream& operator<<(std::ostream& stream, const Value& value);
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std::istream& operator>>(std::istream& stream, Value& value);
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}
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extern template class boost::variant<boost::blank, double, bool, icinga::String, icinga::Object::Ptr>;
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#endif /* VALUE_H */
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