CODEWITHSUNDEEP
c++c++11
Luka
Luka

Reputation: 1801

c++ chrono unexpected behavior

std::chrono::system_clock::time_point start;
//1 second passes
std::cout << (std::chrono::high_resolution_clock::now()-start).count();

The above code, after 1 second, in Visual Studio 2012 gives me 10000000 but on gcc 4.8.2 gives me 100000000.

Changing the last line to std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::high_resolution_clock::now()-start).count(); works as expected and gives me the same result on both compilers.

How is this possible?

Upvotes: 4

Views: 252

Answers (1)

harmic
harmic

Reputation: 30577

According to http://en.cppreference.com/w/cpp/chrono/high_resolution_clock

Class std::chrono::high_resolution_clock represents the clock with the smallest tick period provided by the implementation.

So, GCC has a different resolution to VS.

The standard allows this because different systems have different requirements for time accuracy.

As you have already discovered there are methods of converting such a clock to a known resolution.

Upvotes: 4

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