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added a test and a method

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This commit is contained in:
LPTK 2013-06-12 15:44:59 +02:00
commit 95a6e7a231
1 changed files with 45 additions and 40 deletions
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73
eo/src/eoOptional.h
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@ -32,26 +32,26 @@ For example, this is not valid C++98 code:
\code
struct MyClass {
MyClass(T& my_T = default_T)
: actual_T(my_T)
{ }
MyClass(T& my_T = default_T)
: actual_T(my_T)
{ }
private:
T default_T;
T& actual_T;
}
T default_T;
T& actual_T;
};
\endcode
This is the same code using eoOptional, which is valid:
\code
struct MyClass {
MyClass(eoOptional<T> my_T = NULL)
: actual_T(my_T.getOr(default_T))
{ }
MyClass(eoOptional<T> my_T = NULL)
: actual_T(my_T.getOr(default_T))
{ }
private:
T default_T;
T& actual_T;
}
T default_T;
T& actual_T;
};
\endcode
And from the point of view of the user, it is transparent:
@ -78,36 +78,41 @@ MyClass mc3(t);
template< class T >
class eoOptional {
public:
static const eoOptional<T> null; // = eoOptional<T>();
static const eoOptional<T> null; // = eoOptional<T>();
eoOptional (T& init)
: _val(&init)
{ }
eoOptional (T& init)
: _val(&init)
{ }
// used mainly for converting NULL to this
eoOptional (T* init)
: _val(init)
{ }
// used mainly for converting NULL to this class
eoOptional (T* init)
: _val(init)
{ }
bool hasValue() const
{
return _val != NULL;
}
bool hasValue() const
{
return _val != NULL;
}
T& get () const
{
if (!hasValue())
throw std::runtime_error("Cannot get a reference from a eoOptional wrapper with no value");
return *_val;
}
T& get () const
{
if (!hasValue())
throw std::runtime_error("Cannot get a reference from a eoOptional wrapper with no value");
return *_val;
}
T& getOr (T& default) const
{
return hasValue()? *_val: default;
}
protected:
eoOptional ()
: _val(NULL)
{ }
eoOptional ()
: _val(NULL)
{ }
private:
T* _val;
T* _val;
};
template< class T >