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https://code-examples.net/en/q/1485fb4
gcc c++11 support . Is it intended by the C++ standards committee that in C++11 unordered_map destroys what it inserts? ... I ask this because if there is support here, I intend to submit this behaviour as a N note to WG21 and ask them to implement a better behaviour. As others have pointed out in the comments, the "universal" constructor is ...
https://stackoverflow.com/questions/11614106/is-gcc-stdunordered-map-implementation-slow-if-so-why
I am guessing that you have not properly sized your unordered_map, as Ylisar suggested.When chains grow too long in unordered_map, the g++ implementation will automatically rehash to a larger hash table, and this would be a big drag on performance.If I remember correctly, unordered_map defaults to (smallest prime larger than) 100. I didn't have chrono on my system, so I timed with times().
https://stackoverflow.com/questions/3973659/c-unordered-map-compiling-issue-with-g
In GCC 4.4.x, you should only have to #include <unordered_map>, and compile with this line:. g++ -std=c++0x source.cxx. More information about C++0x support in GCC.. edit regarding your problem. You have to do std::make_pair<char, bool>(*s, true) when inserting.. Also, your code would only insert a single character (the dereferencing via *s).Do you intend to use a single char for a key, or did ...
https://en.cppreference.com/w/cpp/container/unordered_map
(since C++17) Unordered map is an associative container that contains key-value pairs with unique keys. Search, insertion, and removal of elements have average constant-time complexity. Internally, the elements are not sorted in any particular order, but organized into buckets.
https://software.intel.com/en-us/forums/intel-c-compiler/topic/401384
Please take into account that every C++ compiler has different degree of tolerance to some C++ declarations. For example, MSC is not too strict C++ compiler, and MinGW is a very strict C++ compiler ( I could give an example if needed ), and Intel C++ compiler is too strict ( just use /W5 and /check options and you'll see hundreds if not thousands of warnings ).
http://fgda.pl/post/7/gcc-hash-map-vs-unordered-map
Aug 30, 2011 · GCC hash_map vs. unordered_map. Long story cut short: Do not use hash<const char*>. Such keys will be treated as integers. Use C++ strings instead (or create a custom hashing function). It started innocently but, before noticing anything, I was writing C++ code again. I had a problem to solve that asked for something like Python's dictionaries.
https://stackoverflow.com/questions/16136142/c11-functionality-with-mingw
From the GCC documentation. C++0x was the working name of a new ISO C++ standard, which was then released in 2011 as C++11 and introduces a host of new features into the standard C++ language and library. This project seeks to implement new C++11 features in GCC and to make it one of the first compilers to bring C++11 to C++ programmers.
http://www.cplusplus.com/reference/unordered_map/unordered_map/
Unordered Map Unordered maps are associative containers that store elements formed by the combination of a key value and a mapped value, and which allows for fast retrieval of individual elements based on their keys.
https://gcc.gnu.org/onlinedocs/gcc-4.6.3/libstdc++/api/a01103_source.html
See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General ...
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