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Merge pull request #6471 from GilesBathgate/Nef_3-performance_stdmap-GilesBathgate 

Nef_3: Performance std::map -> std::unordered_map
This commit is contained in:
Sebastien Loriot 2022-05-13 15:47:24 +02:00 committed by GitHub
parent 083edccc39 8770c7a0cd
commit 0e0b813736
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 31 additions and 7 deletions
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3
Nef_3/include/CGAL/Nef_3/Binary_operation.h
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@ -319,6 +319,9 @@ class Binary_operation : public CGAL::SNC_decorator<Map> {
CGAL_NEF_TRACEN("=> for all v0 in snc1, qualify v0 with respect snc2");
// int i=2;
Association A;
A.reserve(snc1.number_of_shalfedges() + snc1.number_of_shalfloops() +
snc2.number_of_shalfedges() + snc2.number_of_shalfloops());
SHalfedge_const_iterator sei;
CGAL_forall_shalfedges(sei, snc1)
A.initialize_hash(sei);

27
Nef_3/include/CGAL/Nef_3/ID_support_handler.h
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@ -56,11 +56,27 @@ class ID_support_handler<SNC_indexed_items, Decorator> {
}
};
std::unordered_map<Halffacet_pair, int, Handle_pair_hash_function> f2m;
std::map<int, int> hash;
std::unordered_map<int, int> hash;
public:
ID_support_handler() {}
void reserve(std::size_t n) {
hash.reserve(n);
}
/*
The method get_hash implements a
two-pass union find algorithm
__ __ _______
/ \ / \ / _____\
_|__|__|__|_ _/__/__/__|_
| | v | v | | | | | v |
| O O O O | => | O O O O |
|____|__^____| |____________|
| | root
\_/
*/
int get_hash(int i) {
int root(i);
while(hash[root] != root)
@ -78,14 +94,15 @@ class ID_support_handler<SNC_indexed_items, Decorator> {
hash[get_hash(i)] = parent;
}
template<typename Handle>
void initialize_hash(Handle h) {
hash[h->get_index()] = h->get_index();
}
void initialize_hash(int i) {
hash[i] = i;
}
template<typename Handle>
void initialize_hash(Handle h) {
initialize_hash(h->get_index());
}
void hash_facet_pair(SVertex_handle sv,
Halffacet_const_handle f1,
Halffacet_const_handle f2) {

6
Nef_3/include/CGAL/Nef_3/SNC_external_structure.h
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@ -30,6 +30,7 @@
#include <CGAL/Nef_3/SNC_simplify.h>
#include <map>
#include <list>
#include <unordered_map>
#undef CGAL_NEF_DEBUG
#define CGAL_NEF_DEBUG 43
@ -1308,8 +1309,9 @@ public:
// O0.print();
link_shalfedges_to_facet_cycles();
std::map<int, int> hash;
CGAL::Unique_hash_map<SHalfedge_handle, bool> done(false, this->sncp()->number_of_shalfedges());
std::size_t num_shalfedges = this->sncp()->number_of_shalfedges();
std::unordered_map<int, int> hash(num_shalfedges);
CGAL::Unique_hash_map<SHalfedge_handle, bool> done(false, num_shalfedges);
SHalfedge_iterator sei;
CGAL_forall_shalfedges(sei, *this->sncp()) {

2
Nef_S2/include/CGAL/Nef_S2/ID_support_handler.h
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@ -38,6 +38,8 @@ class ID_support_handler {
public:
ID_support_handler() {}
void reserve(std::size_t) {}
int get_hash(int) { return 0; }
template<typename Handle> void initialize_hash(Handle /*h*/) {}
void initialize_hash(int /*i*/) {}