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Asked: 2026-05-13T20:47:00+00:00

I am asking about the static binding of the function in C++. What’s the

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I am asking about the static binding of the function in C++. What’s the data type conversion rules for the function binding.

Suppose we have 

void func(int x);
void func(long x);
void func(float x);
void func(double x);
void func(char x);

and I have one function in main

func(1)

I know the function func(int x) will be called. I am curious about the rules of that.

Is it always the best match?

Does the order of declaration matter?

In any case the data type conversion will be applied?

What’s the concern when the rules are designed?

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1 Answer

  1. Editorial Team

    Is it always the best match?

    Yes: 1 is an int. If an appropriate overload exists, it will be taken since this minimizes the number of necessary implicit conversions (none).

    Does the order of declaration matter?

    No. However, it matters whether a function has been declared before the call is made. If the function is declared after the call, it will not be taken into consideration for overload resolution.

    In any case the data type conversion will be applied?

    There’s no conversion here because int is an exact match. Conversions only come into play when there’s no exact match available.

    What’s the concern when the rules are designed?

    Well, it’s the only rule that makes sense, isn’t it?

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