What is the explicit keyword in C++?

#include <iostream>

struct Meters {
    explicit Meters(double v) : value(v) {}
    double value;
};

void show(Meters m) { std::cout << m.value << '\n'; }

int main() {
    show(Meters(5));        // fine
    show(5);                // error: the hidden conversion is not allowed
}

Without explicit, show(5) would compile and quietly create a Meters. Mark single argument constructors explicit unless you really want the conversion. See Constructors.

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