Does the function definition inside the header always define so that the compiler treats it as inline?

Question

I just found out that defining a C ++ function inside a class header file makes an inline function. But I know that placing the inline keyword next to a function is just a suggestion, and the compiler will not necessarily follow it. This is the same for the headers defined by C ++ functions, and is there a difference in behavior between the stand-alone C ++ function and the C ++ function that is part of the class?

Answer 1

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    void foo() {}
    void bar();
};

void Foo::bar() {}

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Answer 2

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Answer 3

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Answer 4

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