\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - 2D and 3D Linear Geometry Kernel

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Kernel::AreParallel_2 Concept Reference
Kernel Function Object Concepts

## Definition

Refines:
  `AdaptableFunctor` (with two arguments)

See Also
  `CGAL::parallel()`

## Operations
A model of this concept must provide:
bool | operator() (const Kernel::Line_2 &l1, const Kernel::Line_2 &l2)
| returns `true`, if `l1` and `l2` are parallel or if one of those (or both) is degenerate.
bool | operator() (const Kernel::Ray_2 &r1, const Kernel::Ray_2 &r2)
| returns `true`, if `r1` and `r2` are parallel or if one of those (or both) is degenerate.
bool | operator() (const Kernel::Segment_2 &s1, const Kernel::Segment_2 &s2)
| returns `true`, if `s1` and `s2` are parallel or if one of those (or both) is degenerate.