kicad/include/boost/polygon/interval_concept.hpp

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26 KiB
C++

// Boost.Polygon library interval_concept.hpp header file
// Copyright (c) Intel Corporation 2008.
// Copyright (c) 2008-2012 Simonson Lucanus.
// Copyright (c) 2012-2012 Andrii Sydorchuk.
// See http://www.boost.org for updates, documentation, and revision history.
// 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)
#ifndef BOOST_POLYGON_INTERVAL_CONCEPT_HPP
#define BOOST_POLYGON_INTERVAL_CONCEPT_HPP
#include "isotropy.hpp"
#include "interval_traits.hpp"
namespace boost {
namespace polygon {
struct interval_concept {};
template <typename ConceptType>
struct is_interval_concept {
typedef gtl_no type;
};
template <>
struct is_interval_concept<interval_concept> {
typedef gtl_yes type;
};
template <typename ConceptType>
struct is_mutable_interval_concept {
typedef gtl_no type;
};
template <>
struct is_mutable_interval_concept<interval_concept> {
typedef gtl_yes type;
};
template <typename GeometryType, typename BoolType>
struct interval_coordinate_type_by_concept {
typedef void type;
};
template <typename GeometryType>
struct interval_coordinate_type_by_concept<GeometryType, gtl_yes> {
typedef typename interval_traits<GeometryType>::coordinate_type type;
};
template <typename GeometryType>
struct interval_coordinate_type {
typedef typename interval_coordinate_type_by_concept<
GeometryType,
typename is_interval_concept<
typename geometry_concept<GeometryType>::type
>::type
>::type type;
};
template <typename GeometryType, typename BoolType>
struct interval_difference_type_by_concept {
typedef void type;
};
template <typename GeometryType>
struct interval_difference_type_by_concept<GeometryType, gtl_yes> {
typedef typename coordinate_traits<
typename interval_traits<GeometryType>::coordinate_type
>::coordinate_difference type;
};
template <typename GeometryType>
struct interval_difference_type {
typedef typename interval_difference_type_by_concept<
GeometryType,
typename is_interval_concept<
typename geometry_concept<GeometryType>::type
>::type
>::type type;
};
struct y_i_get : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_get,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_coordinate_type<IntervalType>::type
>::type get(const IntervalType& interval, direction_1d dir) {
return interval_traits<IntervalType>::get(interval, dir);
}
struct y_i_set : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_set,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
void
>::type set(IntervalType& interval, direction_1d dir,
typename interval_mutable_traits<IntervalType>::coordinate_type value) {
interval_mutable_traits<IntervalType>::set(interval, dir, value);
}
struct y_i_construct : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_construct,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type construct(
typename interval_mutable_traits<IntervalType>::coordinate_type low,
typename interval_mutable_traits<IntervalType>::coordinate_type high) {
if (low > high) {
(std::swap)(low, high);
}
return interval_mutable_traits<IntervalType>::construct(low, high);
}
struct y_i_copy_construct : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_copy_construct,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type copy_construct(const IntervalType2& interval) {
return construct<IntervalType1>(get(interval, LOW), get(interval, HIGH));
}
struct y_i_assign : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_assign,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& assign(IntervalType1& lvalue, const IntervalType2& rvalue) {
set(lvalue, LOW, get(rvalue, LOW));
set(lvalue, HIGH, get(rvalue, HIGH));
return lvalue;
}
struct y_i_low : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_low,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_coordinate_type<IntervalType>::type
>::type low(const IntervalType& interval) {
return get(interval, LOW);
}
struct y_i_high : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_high,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_coordinate_type<IntervalType>::type
>::type high(const IntervalType& interval) {
return get(interval, HIGH);
}
struct y_i_low2 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_low2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
void
>::type low(IntervalType& interval,
typename interval_mutable_traits<IntervalType>::coordinate_type value) {
set(interval, LOW, value);
}
struct y_i_high2 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_high2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
void
>::type high(IntervalType& interval,
typename interval_mutable_traits<IntervalType>::coordinate_type value) {
set(interval, HIGH, value);
}
struct y_i_equivalence : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_equivalence,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type equivalence(
const IntervalType1& interval1,
const IntervalType2& interval2) {
return (get(interval1, LOW) == get(interval2, LOW)) &&
(get(interval1, HIGH) == get(interval2, HIGH));
}
struct y_i_contains : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_contains,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
bool
>::type contains(
const IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type value,
bool consider_touch = true ) {
if (consider_touch) {
return value <= high(interval) && value >= low(interval);
} else {
return value < high(interval) && value > low(interval);
}
}
struct y_i_contains2 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_contains2,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type contains(
const IntervalType1& interval1,
const IntervalType2& interval2,
bool consider_touch = true) {
return contains(interval1, get(interval2, LOW), consider_touch) &&
contains(interval1, get(interval2, HIGH), consider_touch);
}
struct y_i_center : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_center,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_coordinate_type<IntervalType>::type
>::type center(const IntervalType& interval) {
return (high(interval) + low(interval)) / 2;
}
struct y_i_delta : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_delta,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_difference_type<IntervalType>::type
>::type delta(const IntervalType& interval) {
typedef typename interval_difference_type<IntervalType>::type diff_type;
return static_cast<diff_type>(high(interval)) -
static_cast<diff_type>(low(interval));
}
struct y_i_flip : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_flip,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType>::type& flip(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type axis = 0) {
typename interval_coordinate_type<IntervalType>::type newLow, newHigh;
newLow = 2 * axis - high(interval);
newHigh = 2 * axis - low(interval);
low(interval, newLow);
high(interval, newHigh);
return interval;
}
struct y_i_scale_up : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_scale_up,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& scale_up(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type factor) {
typename interval_coordinate_type<IntervalType>::type newHigh =
high(interval) * factor;
low(interval, low(interval) * factor);
high(interval, (newHigh));
return interval;
}
struct y_i_scale_down : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_scale_down,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& scale_down(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type factor) {
typedef typename interval_coordinate_type<IntervalType>::type Unit;
typename interval_coordinate_type<IntervalType>::type newHigh =
high(interval) / factor;
low(interval, low(interval) / factor);
high(interval, (newHigh));
return interval;
}
// TODO(asydorchuk): Deprecated.
struct y_i_scale : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_scale,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& scale(IntervalType& interval, double factor) {
typedef typename interval_coordinate_type<IntervalType>::type Unit;
Unit newHigh = scaling_policy<Unit>::round(
static_cast<double>(high(interval)) * factor);
low(interval, scaling_policy<Unit>::round(
static_cast<double>(low(interval)) * factor));
high(interval, (newHigh));
return interval;
}
struct y_i_move : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_move,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& move(
IntervalType& interval,
typename interval_difference_type<IntervalType>::type displacement) {
typedef typename interval_coordinate_type<IntervalType>::type ctype;
typedef typename coordinate_traits<ctype>::coordinate_difference Unit;
low(interval, static_cast<ctype>(
static_cast<Unit>(low(interval)) + displacement));
high(interval, static_cast<ctype>(
static_cast<Unit>(high(interval)) + displacement));
return interval;
}
struct y_i_convolve : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_convolve,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& convolve(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type value) {
typedef typename interval_coordinate_type<IntervalType>::type Unit;
Unit newLow = low(interval) + value;
Unit newHigh = high(interval) + value;
low(interval, newLow);
high(interval, newHigh);
return interval;
}
struct y_i_deconvolve : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_deconvolve,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& deconvolve(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type value) {
typedef typename interval_coordinate_type<IntervalType>::type Unit;
Unit newLow = low(interval) - value;
Unit newHigh = high(interval) - value;
low(interval, newLow);
high(interval, newHigh);
return interval;
}
struct y_i_convolve2 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_convolve2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& convolve(IntervalType1& lvalue, const IntervalType2& rvalue) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit newLow = low(lvalue) + low(rvalue);
Unit newHigh = high(lvalue) + high(rvalue);
low(lvalue, newLow);
high(lvalue, newHigh);
return lvalue;
}
struct y_i_deconvolve2 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_deconvolve2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& deconvolve(IntervalType1& lvalue, const IntervalType2& rvalue) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit newLow = low(lvalue) - low(rvalue);
Unit newHigh = high(lvalue) - high(rvalue);
low(lvalue, newLow);
high(lvalue, newHigh);
return lvalue;
}
struct y_i_reconvolve : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_reconvolve,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& reflected_convolve(
IntervalType1& lvalue,
const IntervalType2& rvalue) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit newLow = low(lvalue) - high(rvalue);
Unit newHigh = high(lvalue) - low(rvalue);
low(lvalue, newLow);
high(lvalue, newHigh);
return lvalue;
}
struct y_i_redeconvolve : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_redeconvolve,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& reflected_deconvolve(
IntervalType1& lvalue,
const IntervalType2& rvalue) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit newLow = low(lvalue) + high(rvalue);
Unit newHigh = high(lvalue) + low(rvalue);
low(lvalue, newLow);
high(lvalue, newHigh);
return lvalue;
}
struct y_i_e_dist1 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<y_i_e_dist1,
typename is_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
typename interval_difference_type<IntervalType>::type
>::type euclidean_distance(
const IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type position) {
typedef typename interval_difference_type<IntervalType>::type Unit;
Unit dist[3] = {
0,
(Unit)low(interval) - (Unit)position,
(Unit)position - (Unit)high(interval)
};
return dist[(dist[1] > 0) + ((dist[2] > 0) << 1)];
}
struct y_i_e_dist2 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_e_dist2,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
typename interval_difference_type<IntervalType1>::type
>::type euclidean_distance(
const IntervalType1& interval1,
const IntervalType2& interval2) {
typedef typename interval_difference_type<IntervalType1>::type Unit;
Unit dist[3] = {
0,
(Unit)low(interval1) - (Unit)high(interval2),
(Unit)low(interval2) - (Unit)high(interval1)
};
return dist[(dist[1] > 0) + ((dist[2] > 0) << 1)];
}
struct y_i_e_intersects : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_e_intersects,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type intersects(
const IntervalType1& interval1,
const IntervalType2& interval2,
bool consider_touch = true) {
return consider_touch ?
(low(interval1) <= high(interval2)) &&
(high(interval1) >= low(interval2)) :
(low(interval1) < high(interval2)) &&
(high(interval1) > low(interval2));
}
struct y_i_e_bintersect : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_e_bintersect,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type boundaries_intersect(
const IntervalType1& interval1,
const IntervalType2& interval2,
bool consider_touch = true) {
return (contains(interval1, low(interval2), consider_touch) ||
contains(interval1, high(interval2), consider_touch)) &&
(contains(interval2, low(interval1), consider_touch) ||
contains(interval2, high(interval1), consider_touch));
}
struct y_i_intersect : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_intersect,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type intersect(
IntervalType1& lvalue,
const IntervalType2& rvalue,
bool consider_touch = true) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit lowVal = (std::max)(low(lvalue), low(rvalue));
Unit highVal = (std::min)(high(lvalue), high(rvalue));
bool valid = consider_touch ? lowVal <= highVal : lowVal < highVal;
if (valid) {
low(lvalue, lowVal);
high(lvalue, highVal);
}
return valid;
}
struct y_i_g_intersect : gtl_yes {};
// TODO(asydorchuk): Deprecated.
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_g_intersect,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
IntervalType1
>::type& generalized_intersect(
IntervalType1& lvalue,
const IntervalType2& rvalue) {
typedef typename interval_coordinate_type<IntervalType1>::type Unit;
Unit coords[4] = {low(lvalue), high(lvalue), low(rvalue), high(rvalue)};
// TODO(asydorchuk): consider implementing faster sorting of small
// fixed length range.
polygon_sort(coords, coords+4);
low(lvalue, coords[1]);
high(lvalue, coords[2]);
return lvalue;
}
struct y_i_abuts1 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_abuts1,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type abuts(
const IntervalType1& interval1,
const IntervalType2& interval2,
direction_1d dir) {
return dir.to_int() ? low(interval2) == high(interval1) :
low(interval1) == high(interval2);
}
struct y_i_abuts2 : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_abuts2,
typename is_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type abuts(
const IntervalType1& interval1,
const IntervalType2& interval2) {
return abuts(interval1, interval2, HIGH) ||
abuts(interval1, interval2, LOW);
}
struct y_i_bloat : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_bloat,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& bloat(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type bloating) {
low(interval, low(interval) - bloating);
high(interval, high(interval) + bloating);
return interval;
}
struct y_i_bloat2 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_bloat2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& bloat(
IntervalType& interval,
direction_1d dir,
typename interval_coordinate_type<IntervalType>::type bloating) {
set(interval, dir, get(interval, dir) + dir.get_sign() * bloating);
return interval;
}
struct y_i_shrink : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_shrink,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& shrink(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type shrinking) {
return bloat(interval, -shrinking);
}
struct y_i_shrink2 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_shrink2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type& shrink(
IntervalType& interval,
direction_1d dir,
typename interval_coordinate_type<IntervalType>::type shrinking) {
return bloat(interval, dir, -shrinking);
}
struct y_i_encompass : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_encompass,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type
>::type,
bool
>::type encompass(IntervalType1& interval1, const IntervalType2& interval2) {
bool retval = !contains(interval1, interval2, true);
low(interval1, (std::min)(low(interval1), low(interval2)));
high(interval1, (std::max)(high(interval1), high(interval2)));
return retval;
}
struct y_i_encompass2 : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_encompass2,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
bool
>::type encompass(
IntervalType& interval,
typename interval_coordinate_type<IntervalType>::type value) {
bool retval = !contains(interval, value, true);
low(interval, (std::min)(low(interval), value));
high(interval, (std::max)(high(interval), value));
return retval;
}
struct y_i_get_half : gtl_yes {};
template <typename IntervalType>
typename enable_if<
typename gtl_and<
y_i_get_half,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType>::type
>::type
>::type,
IntervalType
>::type get_half(const IntervalType& interval, direction_1d dir) {
typedef typename interval_coordinate_type<IntervalType>::type Unit;
Unit c = (get(interval, LOW) + get(interval, HIGH)) / 2;
return construct<IntervalType>(
(dir == LOW) ? get(interval, LOW) : c,
(dir == LOW) ? c : get(interval, HIGH));
}
struct y_i_join_with : gtl_yes {};
template <typename IntervalType1, typename IntervalType2>
typename enable_if<
typename gtl_and_3<
y_i_join_with,
typename is_mutable_interval_concept<
typename geometry_concept<IntervalType1>::type
>::type,
typename is_interval_concept<
typename geometry_concept<IntervalType2>::type
>::type>::type,
bool
>::type join_with(IntervalType1& interval1, const IntervalType2& interval2) {
if (abuts(interval1, interval2)) {
encompass(interval1, interval2);
return true;
}
return false;
}
} // polygon
} // boost
#endif // BOOST_POLYGON_INTERVAL_CONCEPT_HPP