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Message-ID: <542EFEB4.3000107@gmail.com>
Date: Fri, 03 Oct 2014 19:53:00 -0000
From: Allen Webb <vertago1@gmail.com>
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To: overseers@gcc.gnu.org
Subject: gcc bugzilla account creation
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overseers@gcc.gnu.org,

I need to see about filing a bug for the gcc c++11 standard library, but 
I don't have a bugzilla account. the std::map::lower_bound() function 
doesn't work properly when the map only has one element. I have appended 
some test code that shows the problem. When the map has size()==1, the 
lower_bound function returns end() even though there is an element less 
than the key being compared.

Allen

////////////////////////////////////////////////////////////////////////////////

#include <cstdlib>
#include <iostream>
#include <map>

#define ts_t std::pair<uint64_t,uint64_t>

int main() {

     std::map<ts_t,uint32_t> test;

     uint32_t count = 0;

     test.insert(std::make_pair(
         std::make_pair(1403187740ull,698599ull),
         count++
     ));

     ts_t key = std::make_pair(1403187740ull,698600ull);

     auto lower = test.lower_bound(key);
     auto upper = test.upper_bound(key);

     if(lower==test.end()) std::cout<<"no lower bound\n";
     if(upper==test.end()) std::cout<<"no upper bound\n";
     if(test.begin()->first < key) std::cout<<"key is less than begin()\n";

     test.insert(std::make_pair(
         std::make_pair(1403187740ull,698601ull),
         count++
     ));

     lower = test.lower_bound(key);
     upper = test.upper_bound(key);

     if(lower==test.end()) std::cout<<"no lower bound\n";
     if(upper==test.end()) std::cout<<"no upper bound\n";
     if(test.begin()->first < key) std::cout<<"key is less than begin()\n";

     return EXIT_SUCCESS;
}