[Bug libstdc++/64239] New: regex_iterator::operator= should copy match_results::position
kariya_mitsuru at hotmail dot com
gcc-bugzilla@gcc.gnu.org
Tue Dec 9 14:06:00 GMT 2014
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64239
Bug ID: 64239
Summary: regex_iterator::operator= should copy
match_results::position
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: kariya_mitsuru at hotmail dot com
Created attachment 34231
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34231&action=edit
g++ -v
Please see the following sample.
========================================== sample code
==========================================
#include <iostream>
#include <regex>
#include <string>
int main()
{
std::regex re("\\w+");
std::string s("-a-b-c-");
for (auto it1 = std::sregex_iterator(s.begin(), s.end(), re), end =
std::sregex_iterator(); it1 != end; ++it1) {
auto it2 = it1;
std::cout << "position() = " << it1->position() << ", length() = " <<
it1->length() << ", str() = '" << it1->str() << "'\n"
"position() = " << it2->position() << ", length() = " <<
it2->length() << ", str() = '" << it2->str() << "'\n\n";
}
}
=================================================================================================
============================= output =============================
position() = 1, length() = 1, str() = 'a'
position() = 1, length() = 1, str() = 'a'
position() = 3, length() = 1, str() = 'b'
position() = 1, length() = 1, str() = 'b'
position() = 5, length() = 1, str() = 'c'
position() = 1, length() = 1, str() = 'c'
==================================================================
cf. http://melpon.org/wandbox/permlink/IiULKqL2GwCwwvHc
Though the C++11 standard says nothing about regex_iterator::operator=, I think
that it2->position() should be equal to it1->position().
So, the output should be
============================= output =============================
position() = 1, length() = 1, str() = 'a'
position() = 1, length() = 1, str() = 'a'
position() = 3, length() = 1, str() = 'b'
position() = 3, length() = 1, str() = 'b'
position() = 5, length() = 1, str() = 'c'
position() = 5, length() = 1, str() = 'c'
==================================================================
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