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Home/ Questions/Q 7006169
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T21:26:36+00:00 2026-05-27T21:26:36+00:00

I do not understand what is going on. I am just learning C++ and

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I do not understand what is going on. I am just learning C++ and I see something like this a lot:

double some_function(const Struct_Name& s) {
    ...
}

Why the const if we are passing by reference?

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  1. Editorial Team
    Editorial Team
    2026-05-27T21:26:37+00:00Added an answer on May 27, 2026 at 9:26 pm

    A const reference prevents the object from being modified, as const would anywhere else, but also avoids the potential cost of copying.

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