[Solved] Which c++ implementation is preferable, range based loop or count_if

Question

You should almost always use an algorithm like std::count_if if one is available.

The reason is that the compiler vendor can put optimizations in that are not portable if you were to put them in manually in your own loop. For example there are intrinsic functions that could be CPU specific that speed up even basic tasks like counting values in an array.

Unless you have a specific need to use non-portable optimizations then algorithms provided by the compiler in the standard library are likely to be faster in a portable way than something you are likely to write.

Accepted Answer

You should almost always use an algorithm like std::count_if if one is available.

The reason is that the compiler vendor can put optimizations in that are not portable if you were to put them in manually in your own loop. For example there are intrinsic functions that could be CPU specific that speed up even basic tasks like counting values in an array.

Unless you have a specific need to use non-portable optimizations then algorithms provided by the compiler in the standard library are likely to be faster in a portable way than something you are likely to write.