PrismLauncher/launcher/DefaultVariable.h

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#pragma once
template <typename T>
class DefaultVariable
{
public:
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DefaultVariable(const T & value)
{
defaultValue = value;
}
DefaultVariable<T> & operator =(const T & value)
{
currentValue = value;
is_default = currentValue == defaultValue;
is_explicit = true;
return *this;
}
operator const T &() const
{
return is_default ? defaultValue : currentValue;
}
bool isDefault() const
{
return is_default;
}
bool isExplicit() const
{
return is_explicit;
}
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private:
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T currentValue;
T defaultValue;
bool is_default = true;
bool is_explicit = false;
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};