namespace ArrTraits {
/*!
\ingroup PkgArrangementOnSurface2ConceptsFunctionObjects
\cgalConcept

\cgalRefines Functor 

\cgalHasModel ArrangementXMonotoneTraits_2::Are_mergeable_2 

*/

class AreMergeable_2 {
public:

/// \name Operations
/// A model of this concept must provide:
/// @{

/*!
accepts two \f$ x\f$-monotone curves `xc1` and `xc2` and determines 
whether they can be merged to form a single \f$ x\f$-monotone curve. 
`xc1` and `xc2` are mergeable if their underlying curves are 
identical, they share a common endpoint, and they do not bend to form 
a non-\f$ x\f$-monotone curve. 
*/ 
bool operator()(ArrTraits::X_monotone_curve_2 xc1, 
ArrTraits::X_monotone_curve_2 xc2); 

/// @}

}; /* end ArrTraits::AreMergeable_2 */

}
