[/============================================================================
  Boost.Geometry (aka GGL, Generic Geometry Library)

  Copyright (c) 2009-2016 Barend Gehrels, Geodan, Amsterdam, the Netherlands.
  Copyright (c) 2009-2016 Bruno Lalande, Paris, France.
  Copyright (c) 2009-2016 Mateusz Loskot <mateusz@loskot.net>, London, UK.
  Copyright (c) 2011-2016 Adam Wulkiewicz, Lodz, Poland.

  This file was modified by Oracle on 2015, 2016.
  Modifications copyright (c) 2015-2016, Oracle and/or its affiliates.

  Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
  Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

  Use, modification and distribution is subject to the Boost Software License,
  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt)
=============================================================================/]

[section:release_notes Release Notes]

[/=================]
[heading Boost 1.61]
[/=================]

[*Additional functionality]

* Support within and covered_by for Box/Box in spherical and geographic coordinate systems.

[*Improvements]

* Overlay: handle_tangencies replaced by clusters, fixing many cases with colocated turns

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/10866 10866] union_ doesn't work in 1.56 and 1.57.
* [@https://svn.boost.org/trac/boost/ticket/11018 11018] Invalid geometry intersection
* [@https://svn.boost.org/trac/boost/ticket/11576 11576] Intersection gives wrong results.
* [@https://svn.boost.org/trac/boost/ticket/11637 11637] Unused parameter warning.
* [@https://svn.boost.org/trac/boost/ticket/11725 11725] union_ fails to create holes
* [@https://svn.boost.org/trac/boost/ticket/11789 11789] Assertion failure or invalid result of set operations for spherical_equatorial coordinate system.
* [@https://svn.boost.org/trac/boost/ticket/11917 11917] Andoyer distance strategy returns 0 for antipodal points (default geographic distance).
* [@https://svn.boost.org/trac/boost/ticket/11928 11928] Improvement of the accuracy of surveyor area strategy.
* [@https://svn.boost.org/trac/boost/ticket/11966 11966] Compilation error in svg() for box and non-int coordinate type.
* [@https://svn.boost.org/trac/boost/ticket/11984 11984] union_() generates self-intersecting polygon
* [@https://svn.boost.org/trac/boost/ticket/11987 11987] rtree::remove() not compiling for geographic CS.
* [@https://svn.boost.org/trac/boost/ticket/12000 12000] Uninitialized reference in (unused) constructor of relate's mask_handler.
* [@https://svn.boost.org/trac/boost/ticket/12106 12106] Invalid assertion failure in envelope() for non-cartesian very short segments.

[*Bugfixes]

* Fix intersects and disjoints for Segment/Box in cartesian coordinate system when Segment is parallel to Box's face.
* Fix relation operations for Point/Areal in spherical and geographic coordinate systems for edge cases.
* Fix intersect and disjoint for Point/Box and Box/Box in spherical and geographic coordinate systems for some cases.
* Fix within and covered_by for Point/Box in spherical and geographic coordinate systems for some cases.

[/=================]
[heading Boost 1.60]
[/=================]

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/10803 10803] Union algorithm returning invalid geometry
* [@https://svn.boost.org/trac/boost/ticket/11522 11522] Namespace clash in buffer for traits::detail
* [@https://svn.boost.org/trac/boost/ticket/11533 11533] Assert failure in rtree caused by a bug in remove() if min elements number is 1
* [@https://svn.boost.org/trac/boost/ticket/11607 11607] Private geometry::exception::what()
* [@https://svn.boost.org/trac/boost/ticket/11709 11709] is_simple segfault
* [@https://svn.boost.org/trac/boost/ticket/11710 11710] is_simple - empty geometry logic
* [@https://svn.boost.org/trac/boost/ticket/11711 11711] is_simple and is_valid - Points that are NaN or Infinity

[*Bugfixes]

* Fix colocations of touching interior ring / exterior ring, where it also touches another polygon
* Fix removing values from an empty rtree - no effect and 0 returned instead of assertion failure
* Fix segfault in centroid for multi geometries containing empty single geometries (thanks to Jiri Drbalek)
* Fix liang_barsky strategy for integral coordinates (thanks to Dane Springmeyer)

[/=================]
[heading Boost 1.59]
[/=================]

[*Additional functionality]

* Added rtree const_iterator, begin(), end() and the support for Boost.Range.
* The support for C++11 `std::initializer_list` in geometries models.
* Disjoint and intersects support the following geometry combinations: multipoint/linestring, multipoint/multilinestring.
* Added relate() and relation() algorithms.
* Intersection has been implemented for combinations of pointlike and linear geometries
* Added implementation for difference(pointlike, linear)
* New algorithm is_empty, returning true if the geometry represents the empty set
* The envelope algorithm supports pointlike and linear geometries in the spherical equatorial coordinate system
* The envelope algorithm supports pointlike geometries in the geographic coordinate system

[*Improvements]

* Upgraded rtree const_query_iterator category to ForwardIterator.
* Buffer performance of buffers around multi-points is improved significantly

[*Breaking changes]

* buffer side strategy now returns error_code instead of bool. If you have your own custom side strategy, it should be adapted

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/11113 11113] Support easy enumeration of all elements with BOOST_FOREACH
* [@https://svn.boost.org/trac/boost/ticket/11232 11232] Feature request - relate()
* [@https://svn.boost.org/trac/boost/ticket/11236 11236] Invalid result of centroid() for integer coordinate type
* [@https://svn.boost.org/trac/boost/ticket/11268 11268] Regression in boost::geometry::intersection interface with multi_linestring and box -- does not compile on 1.57 VS 1.55
* [@https://svn.boost.org/trac/boost/ticket/11332 11332] Assertion failure in buffer for extreme coordinate differences
* [@https://svn.boost.org/trac/boost/ticket/11346 11346] Segment iterator does not work with ranges returning values instead of references
* [@https://svn.boost.org/trac/boost/ticket/11436 11436] sym_difference(py1, py2, mpy) returns invalid multipolygon

[*Bugfixes]

* Buffer: use a more robust way to calculate the side of an intersection, this fixes several errors in buffer generation
* Fix in selection of segment to which calculate from IP from, in intersection of two segments. Now is selected the one close to a segment-point point, or else the one on the shortest segment. This avoids (rarely occuring) generation of tiny triangles making output polygons invalid
* In rescaling round instead of truncate to the integer grid (this fix and the previous mentioned can have some impact on output geometries)
* Fix potential infinite loop in detail::has_spikes (the loop can happen if the points passed have NaN coordinates)

[/=================]
[heading Boost 1.58]
[/=================]

[*Additional functionality]

* New algorithm num_segments, returning the number of segments of a geometry
* New overload for is_valid algorithm, that takes a string reference as a second argument and fills it with a message related to the validity or invalidity of the geometry
* New overload for is_valid algorithm, that takes an enum reference as a second argument and fills it with a value related to the validity or invalidity of the geometry
* Disjoint and intersects support the following geometry combinations: point/multipoint, multipoint/multipoint, multipoint/segment, multipoint/box

[*Improvements]

* Buffer now supports flat-ends for linestrings with a bend close to the start (such that buffered segment crosses flat-end).
* Buffer performance is improved significantly
* Partition performance is improved significantly for polygons, potentially enhancing all overlay operations

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/8379 8379] Invalid comparison of the result of determinant
* [@https://svn.boost.org/trac/boost/ticket/10108 10108] Error in overlay operations in specific cases where geometries touch at one point
* [@https://svn.boost.org/trac/boost/ticket/10201 10201] Suggestion to use different function to compare coordinates [wontfix]
* [@https://svn.boost.org/trac/boost/ticket/10467 10467] Template parameter name coliding with B0 macro name defined in termios.h
* [@https://svn.boost.org/trac/boost/ticket/10640 10640] Invalid result of buffer() for CCW Polygons.
* [@https://svn.boost.org/trac/boost/ticket/10666 10666] MSVC compiler warning C4127: conditional expression is constant
* [@https://svn.boost.org/trac/boost/ticket/10747 10747] Error in rescaling causing errors in areal/areal set operations
* [@https://svn.boost.org/trac/boost/ticket/10770 10770] Buffer fails for large distances, or rough round joins, where concavities where not intersected properly
* [@https://svn.boost.org/trac/boost/ticket/10658 10658] sym_difference yields bad result for int polygons
* [@https://svn.boost.org/trac/boost/ticket/10835 10835] Difference of multilinestring and polygon yields wrong result
* [@https://svn.boost.org/trac/boost/ticket/10861 10861] Rtree failing to compile for Value being a pair or a tuple containing pointer to Geometry and the default equal_to<> used
* [@https://svn.boost.org/trac/boost/ticket/10863 10863] Template parameter name coliding with B0 macro name defined in termios.h (duplicate of 10467)
* [@https://svn.boost.org/trac/boost/ticket/10887 10887] Invalid result of within() and relate() for Linear/MultiPolygon
* [@https://svn.boost.org/trac/boost/ticket/10890 10890] Invalid result of disjoint() for Point/Segment.
* [@https://svn.boost.org/trac/boost/ticket/10904 10904] Invalid calculation of most significant Dimension of a segment in relate_cartesian_segments strategy
* [@https://svn.boost.org/trac/boost/ticket/10912 10912] Invalid result of within() and relate() for Areal/Areal
* [@https://svn.boost.org/trac/boost/ticket/10951 10951] Tests failing on windows with intel compiler due to lack of /bigobj flag.
* [@https://svn.boost.org/trac/boost/ticket/10957 10957] Assertion failure and invalid results of various relational operations.
* [@https://svn.boost.org/trac/boost/ticket/10958 10958] Invalid results of disjoint() L/L and L/A.
* [@https://svn.boost.org/trac/boost/ticket/10959 10959] Assertion failure in get_turns() used with no_rescale_policy.
* [@https://svn.boost.org/trac/boost/ticket/10960 10960] Invalid result of get_turns() for L/A, missing turn.
* [@https://svn.boost.org/trac/boost/ticket/10961 10961] Invalid result of get_turns() for L/A, invalid turn for a Linear spike.
* [@https://svn.boost.org/trac/boost/ticket/11112 11112] Compilation failure on Solaris due to a CS name clash (used for a macro on this platform)
* [@https://svn.boost.org/trac/boost/ticket/11121 11121] Invalid result of difference() for integral coordinates

[*Bugfixes]

* Bug in multipoint/polygon multipoint/multipolygon distance computation (wrong detection of points inside the areal geometry)
* Bug in flatten_iterator's assignment operator causing an access violation 
* Bug in Cartesian segment-segment intersection strategy when one segment degenerates to a point and is collinear to the other non-degenerate segment
* Bug in centroid(), non-deterministic result if calculated for e.g. a Polygon with zero-area.
* Bug in buffers for joins with a limited number of points
* Bug in buffers for round joins with limited number of points around sharp corners
* Bug in buffers for joins with large buffer distances
* Bug in buffers for round ends with an odd number of points
* Bug in buffers for flat ends with large buffer distances
* Bug in buffers for interior rings with large negative buffer distances
* Bug in closing_iterator not working properly when the input range is empty
* Bug in is_simple, not handling properly closed simple linestrings within multilinestrings
* Bug in rtree constructors taking a pair of Iterators or a Range (packing algorithm), the use of reference to destroyed temporary when Iterator's reference is not true reference, e.g. for some of the Range Adaptors. It also affects distance() and comparable_distance(). This bug may cause unexpected behavior of the rtree or distance() algorithm, e.g. an assertion failure or a SEGFAULT.
* Bug in rtree count() member function, the use of reference to destroyed temporary when object of type convertible but not the same as value_type or indexable_type is passed. If this happens, wrong result may be returned, in most cases 0.
* Bugs related to the handling of Ranges, preventing compilation of Geometries using non-Container Ranges in some algorithms (thanks to Samuel Debionne)

[/=================]
[heading Boost 1.57]
[/=================]

[*Improvements]

* The support of parameters convertible to value_type in rtree insert(), remove() and count() functions
* Support for counterclockwise input/output in algorithm buffer
* Support for open-geometry input in algorithm buffer (open output not yet supported)
* Support for degenerate input (point-like linestrings, polygons) in algorithm buffer

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/6443 6443] Wrong degenerated hulls returned by convex_hull().
* [@https://svn.boost.org/trac/boost/ticket/8402 8402] Implicit conversion warnings
* [@https://svn.boost.org/trac/boost/ticket/9354 9354] Bug in winding strategy affecting within() and covered_by() for non-cartesian coordinate systems
* [@https://svn.boost.org/trac/boost/ticket/10177 10177] Missing include
* [@https://svn.boost.org/trac/boost/ticket/10345 10345] Distance fails to compile for some coordinate types
* [@https://svn.boost.org/trac/boost/ticket/10398 10398] Wrong neighbour check in buffer, calculating turns
* [@https://svn.boost.org/trac/boost/ticket/10421 10421] Invalid Point-Box distance for spherical CS
* [@https://svn.boost.org/trac/boost/ticket/10562 10562] Invalid number of Points in the result of convex_hull() for open output
* [@https://svn.boost.org/trac/boost/ticket/10615 10615] Rtree constructor feature request
* [@https://svn.boost.org/trac/boost/ticket/10643 10643] Invalid point_on_surface() result for big coordinates
* [@https://svn.boost.org/trac/boost/ticket/10647 10647] Invalid result of disjoint() in some cases when polygon is inside inner ring of other polygon
* [@https://svn.boost.org/trac/boost/ticket/10668 10668] Implicit conversion warnings (duplicated 8402)

[*Bugfixes]

* Several fixes of bugs in algorithm buffer
* Bug in point_on_surface() for CCW Polygons (extreme_points()) and numerical issue (thanks to Matt Amos)
* Bug in disjoint() for A/A fixed by replacement of point_on_surface() with point_on_border() (thanks to Matt Amos)
* The result of convex_hull(), duplicated Point in open output, too small number of Points for 1- and 2-Point input
* Imprecision for big coordinates in centroid(), fixed by Points translation (related with ticket 10643)
* for_each_segment() not taking into account the last segment of open Geometry

[/=================]
[heading Boost 1.56]
[/=================]

[*Additional functionality]

* New algorithm buffer for inflating/deflating geometries (buffer itself already existed but that was only to enlarge a box)
* New algorithm remove_spikes, algorithm to remove spikes from a ring, polygon or multi_polygon
* New algorithm point_on_surface, generating a point lying on the surface (interior) of the polygon
* New algorithm is_simple, returning true if a geometry is simple according to the OGC standard
* New algorithm is_valid, returning true if a geometry is valid according to the OGC standard
* New algorithm crosses for checking this spatial relation according to the OGC standard
* The set operation algorithms (difference, intersection, sym_difference and union_) now support as input pairs of pointlike or linear geometries
* The distance and comparable_distance algorithms now support all pairs of geometry combinations
* The spatial relations which didn't support it (covered_by, touches, within, etc.) now support as input linear and/or areal geometries
* The support for boost::variants as input geometries in various algorithms
* The rtree support for indexing segments
* The rtree nearest() predicate support for arbitrary geometries

[*Improvements]

* The rtree pack-creation algorithm optimization (thanks to Lu Wang)

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/8310 8310] Wrong results with overlapping polygons (fixed using point_on_surface for disjoint)
* [@https://svn.boost.org/trac/boost/ticket/8375 8375] sym_difference of non-closed polygons returns closed polygon
* [@https://svn.boost.org/trac/boost/ticket/8376 8376] difference of non-closed polygons returns closed polygon
* [@https://svn.boost.org/trac/boost/ticket/9081 9081] Booleans create self-intersecting polygons from non-self-intersecting polygons
* [@https://svn.boost.org/trac/boost/ticket/9245 9245] Check for process errors in make_qbk.py
* [@https://svn.boost.org/trac/boost/ticket/9563 9563] (Sym)difference not successful, fixed by rescaling to robust type
* [@https://svn.boost.org/trac/boost/ticket/9628 9628] Wrong result of within() due to the winding strategy not working correctly for nearly-horizontal segments
* [@https://svn.boost.org/trac/boost/ticket/9828 9828] boost::geometry::union_(...) creates redundant closing point
* [@https://svn.boost.org/trac/boost/ticket/9871 9871] Remove spike in polygon with only a spike
* [@https://svn.boost.org/trac/boost/ticket/9941 9941] Add support for touches(box, box)
* [@https://svn.boost.org/trac/boost/ticket/9947 9947] Missing info about WKT in documentation
* [@https://svn.boost.org/trac/boost/ticket/9759 9759] Invalid results of R-tree knn queries for non-cartesian coordinate systems
* [@https://svn.boost.org/trac/boost/ticket/10019 10019] Difference of Linestring and Box returns their intersection
* [@https://svn.boost.org/trac/boost/ticket/10077 10077] Wrong types in concept checks in boost/geometry/arithmetic/arithmetic.hpp
* [@https://svn.boost.org/trac/boost/ticket/10234 10234] Wrong results of covered_by() for nearly-horizontal segments

[*Bugfixes]

* intersects(polygon) could return a self-intersection-point for its closing point, fixed
* equals() could return invalid results for non-simple linear geometries according to the OGC standard, fixed
* touches() didn't work properly for CCW areal geomtries, fixed
* rtree nearest queries returned wrong elements for non-cartesian coordinate systems, fixed
* rtree crashed in some cases when used with Interprocess allocator, fixed

[/=================]
[heading Boost 1.55]
[/=================]

[*Additional functionality]

* Added centroid for segment type
* Added intersects() and disjoints() for Segment-Box and Linestring-Box
* Added rtree creation using packing algorithm
* Added contains() and covers() spatial query predicates
* Added iterative queries

[*Documentation]

[*Bugfixes]

* In some cases .back() or .clear() was called, violating the usage of Concepts. Fixed for the reported cases
* Use consistent side information in cart_intersect and get_turn_info and handle_tangencies and enrich_intersection_info. This
  is done by switching to integer (if necessary) for the specific 6 points only, zooming in on the 4 or 3 segments

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/6958 6958] Intersection generates self-intersection. Caused by spike, fixed
* [@https://svn.boost.org/trac/boost/ticket/8364 8364] Invalid input exception, caused by spikes in previous steps, fixed
* [@https://svn.boost.org/trac/boost/ticket/8365 8365] Invalid input exception, caused by spikes in previous steps, fixed
* [@https://svn.boost.org/trac/boost/ticket/8969 8969] boost::geometry::model::point single argument constructor should be explicit
* [@https://svn.boost.org/trac/boost/ticket/8825 8825] Patch adding member variable documentation to doxygen_xml2qbk
* [@https://svn.boost.org/trac/boost/ticket/8652 8652] Intersection fails for triangle-triangle intersection. Caused by spike, fixed
* [@https://svn.boost.org/trac/boost/ticket/9047 9047] Boost files that include themselves (strategies/intersection.hpp), fixed

[*Internal changes]

* Adapted projected_point<> distance strategy, point-type in template is replaced by calculation-type
* Adapted transform strategies, they have points now as member-template, and calculation-type as template. Similar to what was done for projected_point distance
* Spikes (could be generated in difference) in integer-based overlays are now avoided during generation
* Cleanup, removed old MSVC2005 project files
* R*-tree balancing algorithm optimized

[/=================]
[heading Boost 1.54]
[/=================]

[*Additional functionality]

* added Spatial Index, developed for Boost.Geometry by Adam Wulkiewicz. The spatial index was originally started by Federico J. Fernandez during the Google Summer of Code 2008 program, mentored by Hartmut Kaiser.
* added SVG-output, this was already in extensions for several years

[*Documentation]

* small fixes of missing words
* fixes in doc of template parameters (convex_hull, exterior_ring, return_buffer)

[*Bugfixes]

* collinear opposite segments did sometimes (in circles) have a robustness issue, fixed
* fixed insertion of false intersection point (found by buffer)
* applied patch of Vladimir Petrovic for debugging traversals


[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/7462 7462] degenerate union result for float, fixed
* [@https://svn.boost.org/trac/boost/ticket/7465 7465] wrong construtors access type in scale_transformer class, fixed
* [@https://svn.boost.org/trac/boost/ticket/7802 7802] cart_intersect.hpp unused parameter warnings, fixed
* [@https://svn.boost.org/trac/boost/ticket/8254 8254] faulty intersection, fixed
* [@https://svn.boost.org/trac/boost/ticket/8393 8393] polygon model doesn't adhere to stated Polygon concept rules, doc updated.
* [@https://svn.boost.org/trac/boost/ticket/8403 8403] silenced compiler warning C4127: conditional expression is constant
* [@https://svn.boost.org/trac/boost/ticket/8405 8405] silenced compiler warning C4189: '...' : local variable is initialized but not referenced

[*Internal changes]

* Made several algorithms variant-aware (append, area, clear, convert, equals, length, num_points)


[/=================]
[heading Boost 1.53]
[/=================]

[*Bugfixes]

* avoid generating output polygons with interior rings below minimum size (e.g. one or two points)
* `geometry::disjoint` for degenerate segments (patched by Karsten Ahnert)
* problem in `geometry::difference` for missing handling tangency, reported by H2
* fixed `geometry::for_each` for use with Lambda's
* fixed `geometry::comparable_distance` point-linestring (and -range, -polygon)

[*Additional functionality]

* combinations for `geometry::disjoint`: point/ring, point/polygon, point/multi_polygon
* combinations for `geometry::intersects`: point/ring, point/polygon, point/multi_polygon

[*Internal changes]

* updates in specializations/not_implemented for various algorithms (as in an earlier version, these changes are still going on; they take care for simplified structs, better error reporting, and automatized documentation)
* fixes in unit tests

[/=================]
[heading Boost 1.51]
[/=================]

[*Breaking changes]

* points accessed through a pointer (e.g. in a linestring) should now be specialized without the pointer. In previous versions a type `my_point` used like `linestring<my_point*>` had to be specalized like: `template<> struct tag<my_point*>`. Now the library itself removes the pointer before calling the traits class, so now it should be like: `template<> struct tag<my_point>`

[*Bugfixes]

* intersection was sometimes wrong for integer points, fixed
* documentation, order of parameters in simplify was wrong, fixed

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/7030 7030] spherical distance, fixed (by patch of Karsten Ahnert)


[/=================]
[heading Boost 1.50]
[/=================]

[*Bugfixes]

* the return type of comparable projected point strategy for integer points was wrong (integer), fixed
* several robustness issues in intersection of segments and polygons, fixed
* invalid intersection output is filtered out
* disjoint for multi_polygon's might incorrectly return true, fixed

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/6585 6585] patch for alternative syntax multipoint, applied
* [@https://svn.boost.org/trac/boost/ticket/6584 6584] patch for bug in distance, applied
* [@https://svn.boost.org/trac/boost/ticket/5730 5730] same issue as 6584, fixed
* [@https://svn.boost.org/trac/boost/ticket/6166 6166] patch for missing transformation, applied
* [@https://svn.boost.org/trac/boost/ticket/6696 6696] invalid intersection output, was (by chance) already fixed in Trunk before reported

[*Additional functionality]

* added algorithm "touches" (OGC SF compliant) for *polygon/*polygon

[/=================]
[heading Boost 1.49]
[/=================]

[*Breaking changes]

* point_xy was accidentally included in one of the headerfiles. If the point_xy class is used, it should be included explicitly now.

[*Bugfixes]

* bugfix: distance for multi-geometries ignored specified distance strategy. Fixed
* bugfix: difference for polygon/multi_polygon (reported 2011/10/24 on GGL-list)
* bugfix: raise exception for calculation of distances of multi-geometrie(s) where one of them is empty
* bugfix: multi DSV did not correctly use settings, fixed
* bugfix: self-intersections could sometimes be missed (introduced in 1.48), fixed
* bugfix: convex hull crashed on empty range (e.g. empty multi point), fixed
* bugfix: area/centroid/side/intersection/distance did not work for "int" type filled with large (but not overflowing) integers. Fixed.
* bugfix: disjoint/intersect did not work for degenerate linestrings. Fixed.
* bugfix: covered_by did not compile for a ring. Fixed.

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/6019 6019] convex_hull / area, fixed.
* [@https://svn.boost.org/trac/boost/ticket/6021 6021] convex_hull / append (multipoint), fixed.
* [@https://svn.boost.org/trac/boost/ticket/6028 6028] Documentation: closure, fixed.
* [@https://svn.boost.org/trac/boost/ticket/6178 6178] Missing headerfile, fixed.

[*Additional functionality]

* support for line/polygon intersections and differences
* support for convert of segment/box of different point types
* support for append for multi point
* the scalar function distance now throws an empty_input_exception on empty input

[*Documentation]

* updated support status in several algorithms
* updated conformance to OGC or std
* other updates and fixes

[*Internal changes]

* updates in specializations/not_implemented for distance/convert/assign/area/with/covered_by
* move of wkt/dsv to io folder, making domains redundant
* warnings: strategy concepts assigned to zero to avoid clang warnings (patched by Vishnu)
* warnings: there were several unused parameters, for which gcc/clang warned (patched by Christophe)

[/=================]
[heading Boost 1.48]
[/=================]

[*Bugfixes]

* Robustness issue, in some circumstances the union failed to output. Fixed.
* Robustness issue, in some circumstances the calculated intersection point was outside the segment. Fixed.
* Concept issue, cartesian intersect didn't understand segments other than the provided one. Fixed.
* Sometimes self-intersections in linestrings were missed. Fixed.
* The fusion coordinate system was not registered correctly. Fixed.

[*Solved tickets]

* [@https://svn.boost.org/trac/boost/ticket/5726 5726] Segment intersection algorithm still assumes 'first', 'second' members
* [@https://svn.boost.org/trac/boost/ticket/5744 5744] Mistake in fusion adapt example
* [@https://svn.boost.org/trac/boost/ticket/5748 5748] Needed to include <boost/foreach.hpp>
* [@https://svn.boost.org/trac/boost/ticket/5954 5954] distance_pythagoras skips sqrt() step

[*Improvements on algorithms]

* Checking self-intersections is now not done automatically, this can blast performance.
* Besides that, checking self-intersections is made faster.
* Intersections now avoid outputting duplicate points. So they output the minimal set.

[*Additional algorithms]

* covered_by: within is defined as "within, not on boundary". covered_by is "within or on boundary"

[*Additional functionality]

* within: strategies can now be specified for within<point, box> and within<box, box>
* convert: a much broader range of conversions is supported
* assign: idem, (currently partly) synonym for convert (but reversed arguments)

[*Additional coordinate types]

* Basic (limited) support for Boost.Rational
         
[heading Boost 1.47]

Original release         

[endsect]
