mirror of https://github.com/SeanOMik/libki.git
67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
#pragma once
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#include <utility>
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#include <stdexcept>
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#include <typeinfo>
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namespace ki
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{
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namespace pclass
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{
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/**
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* A wrapper around a void pointer that ensures type safety.
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*/
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class Value
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{
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public:
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template <typename T>
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Value(T &value)
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{
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m_value_ptr = value;
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m_type_hash = typeid(value).hash_code();
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}
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Value(Value &&o) noexcept
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: m_value_ptr(std::move(m_value_ptr))
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, m_type_hash(std::move(o.m_type_hash))
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{}
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/**
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* @return Whether or not the value being held is of type T.
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*/
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template <typename T>
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bool is() const
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{
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// Do the type hashes match?
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return m_type_hash == typeid(T).hash_code();
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}
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/**
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* @return A reference to the value being held as the specified type.
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*/
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template <typename T>
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const T &get() const
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{
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// Make sure that this is allowed
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if (!is<T>())
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throw std::runtime_error("Type mismatch in Value::get<T>() call.");
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return *(T *)m_value_ptr;
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}
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/**
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* @return A reference to the value being held as the specified type.
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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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// Make sure that this is allowed
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if (!is<T>())
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throw std::runtime_error("Type mismatch in Value::get<T>() call.");
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return *(T *)m_value_ptr;
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}
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private:
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void *m_value_ptr;
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std::size_t m_type_hash;
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};
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}
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} |