unordered_map not found

Question

I need to use a .cpp file which contains #include <unordered_map> in a Qt project (Based on Qt 5.4.2 (Clang 6.0 (Apple), 64 bit)). However, I got the error: 'unordered_map' file not found. I had checked the path of the folder where unordered_map header file locates is the same as <algorithm>, <utility>, <iostream>, and <sstream> which are included in the beginning of the same .cpp file. Only 'unordered_map' cannot be found. Any suggestion?

Have you enabled C++11 (or later)? If there's no checkbox in the project settings, manually add the flag `-std=c++11`. — Some programmer dude, Aug 29 '15 at 16:04
look if https://stackoverflow.com/questions/26233011/what-could-cause-clang-to-not-find-the-unordered-map-header can solve your problem — gengisdave, Aug 29 '15 at 16:05
Qt provides [QHash](http://doc.qt.io/qt-5/qhash.html#details), I would use it instead `unordered_map`. — Marek R, Aug 29 '15 at 17:10

score 1 · Answer 1 · answered Aug 29 '15 at 16:04

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The std::unordered_map template class was added in C++11, so you are probably not compiling with C++11 support. This is especially true considering that <algorithm>, <utility>, <iostream> and <sstream> work just fine (which all existed before C++11).

Simply add the -std=c++11 flag while compiling.

answered Aug 29 '15 at 16:04

Shoe

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Yes you are right. Thank you! – iik Aug 29 '15 at 20:44

score 1 · Accepted Answer · edited May 23 '17 at 11:53

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Addconfig +=c++11 in pro file

You can refer this.

edited May 23 '17 at 11:53

Community

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answered Aug 29 '15 at 16:24

Swapnil

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unordered_map not found

2 Answers2