holder_initializer.h

#pragma once
 
#include <system/smart_ptr.h>
#include <system/string.h>
 
namespace System
{
 
template <typename T, bool R = System::IsSmartPtr<T>::value || std::is_same<System::String, T>::value>
struct HolderInitializer
{
private:
    T& m_holder;
public:
    inline HolderInitializer(T& holder) : m_holder(holder) {}
 
    inline const T& HoldIfTemporary(const T& value)
    {
        return value;
    }
 
    inline const T& HoldIfTemporary(T& value)
    {
        return value;
    }
 
    inline const T& HoldIfTemporary(T&& value)
    {
        m_holder = value;
        return m_holder;
    }
 
    inline const T& Hold(const T& value)
    {
        m_holder = value;
        return m_holder;
    }
};
 
template <typename T>
struct HolderInitializer<T, false>
{
public:
    inline HolderInitializer(T& holder) {}
 
    inline const T& HoldIfTemporary(const T& value)
    {
        return value;
    }
 
    inline const T& Hold(const T& value)
    {
        return value;
    }
};
 
}