Check out example codes for "error: ‘sleep’ was not declared in this scope". It will help you in understanding the concepts better.
Code Example 1
Solution: #include <unistd.h> Include unistd.h header file will solve the error. Explanation: "sleep" function in c++ context, include in header file "unistd.h" . otherwise we can see compilation error like below. [email protected]:~/test$ g++ open_videofile.cpp `pkg-config --cflags --libs opencv` -g open_videofile.cpp: In function ‘int main(int, char**)’: open_videofile.cpp:34:2: error: ‘sleep’ was not declared in this scope sleep(5); ^~~~~
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