struct WithImplicit {
	WithImplicit(int) {}
};

struct WithExplicit {
	explicit WithExplicit(int) {}
};

struct Without {
};

// implicit conversion (usually more hidden than this exposed example)
// this is often a bug if the class is not a "Better int"
WithImplicit withImplicit = 12345; 

// implicit conversion from int is prohibited by an explicit constructor
WithExplicit withExplicit = 12345;
WithExplicit withExplicit1(12345); // this is not an implicit conversion
WithExplicit withExplicit2 = WithExplicit(12345); // this is not implicit

// implicit conversion from int is prohibited by a lack of constructor
Without without = 12345;