https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106869
Bug ID: 106869
Summary: ranges::unique does nothing unless ranges::sort called
first or something else is wrong.
Product: gcc
Version: 12.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: info at kemalakcam dot com
Target Milestone: ---
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
cat ka_example_ranges_unique.cpp
// 20220622T0300 : Kemal Akcam : [email protected] :
ka_example_ranges_unique.cpp
// compile below code with gcc -lstdc++ -std=c++20 ka_example_ranges_unique.cpp
-o ka_example_ranges_unique
#include <bits/stdc++.h>
using namespace std;
class c
{
public:
vector<string> v;
void printVectorContent(void)
{
cout << "vector<string> v = ";
for(int i=0; i < v.size(); i++)
cout << v[i].c_str() << " ";
cout << endl;
};
};
int main(void)
{
c *k = new c();
k->v = {"aa", "ab", "ga", "ewr", "r42","rtwgh", "qwq","fasa", "ss","aa",
"awrq1", "aa"};
k->printVectorContent();
cout << "ranges::unique(v);" << endl;
ranges::unique(k->v);
k->printVectorContent();
cout << "20220622T0300 : Kemal Akcam : ranges::unique did not function, there
are still 3 x 'aa' in vector" << endl;
cout << "ranges::sort(v);" << endl;
ranges::sort(k->v);
k->printVectorContent();
cout << "ranges::unique(v);" << endl;
ranges::unique(k->v);
k->printVectorContent();
cout << "20220622T0300 : Kemal Akcam : ranges::unique did function after
running ranges::sort, there are not 3 x 'aa' in vector, only 1 x 'aa'" << endl;
}
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
gcc -lstdc++ -std=c++20 ka_example_ranges_unique.cpp -o
ka_example_ranges_unique
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
./ka_example_ranges_unique
vector<string> v = aa ab ga ewr r42 rtwgh qwq fasa ss aa awrq1 aa
ranges::unique(v);
vector<string> v = aa ab ga ewr r42 rtwgh qwq fasa ss aa awrq1 aa
20220622T0300 : Kemal Akcam : ranges::unique did not function, there are still
3 x 'aa' in vector
ranges::sort(v);
vector<string> v = aa aa aa ab awrq1 ewr fasa ga qwq r42 rtwgh ss
ranges::unique(v);
vector<string> v = aa ab awrq1 ewr fasa ga qwq r42 rtwgh ss
20220622T0300 : Kemal Akcam : ranges::unique did function after running
ranges::sort, there are not 3 x 'aa' in vector, only 1 x 'aa'
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
cat /proc/version
Linux version 4.19.0-13-amd64 ([email protected]) (gcc version
8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.160-2 (2020-11-28)
ka@localhost:~/projects/ka_projects/ka_examples_cpp20/ka_example_ranges_unique$
gcc --version
gcc (GCC) 12.1.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Adding below instead of #include <bits/stdc++.h> gives same result.
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
