Problem:
```sh
[ 53%] Building CXX object CMakeFiles/brisk.dir/src/brisk-layer.cc.o
/home/ubuntu/brisk/src/brisk-feature-detector.cc: In function ‘void {anonymous}::RemoveInvalidKeyPoints(const cv::Mat&, std::vector
*)’:
/home/ubuntu/brisk/src/brisk-feature-detector.cc:61:8: error: ‘function’ is not a member of ‘std’
std::function masking =
^~~~~~~~
/home/ubuntu/brisk/src/brisk-feature-detector.cc:61:8: note: suggested alternative: ‘is_function’
std::function masking =
^~~~~~~~
is_function
/home/ubuntu/brisk/src/brisk-feature-detector.cc:61:17: error: expected primary-expression before ‘bool’
std::function masking =
^~~~
/home/ubuntu/brisk/src/brisk-feature-detector.cc:71:22: error: ‘masking’ was not declared in this scope
masking), keypoints->end());
^~~~~~~
/home/ubuntu/brisk/src/brisk-feature-detector.cc:71:22: note: suggested alternative: ‘mask’
masking), keypoints->end());
^~~~~~~
mask
CMakeFiles/brisk.dir/build.make:94: recipe for target 'CMakeFiles/brisk.dir/src/brisk-feature-detector.cc.o' failed
make[2]: *** [CMakeFiles/brisk.dir/src/brisk-feature-detector.cc.o] Error 1
make[2]: *** Waiting for unfinished jobs....
CMakeFiles/Makefile2:144: recipe for target 'CMakeFiles/brisk.dir/all' failed
make[1]: *** [CMakeFiles/brisk.dir/all] Error 2
Makefile:148: recipe for target 'all' failed
make: *** [all] Error 2
```
Solution:
```sh
在brisk-feature-detector.cc文件中添加#include 就可以了
```
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