i + right.i);
}
const Integer
operator-(const Integer& left,
const Integer& right) {
return Integer(left.i - right.i);
}
const Integer
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operator*(const Integer& left,
const Integer& right) {
return Integer(left.i * right.i);
}
const Integer
operator/(const Integer& left,
const Integer& right) {
require(right.i != 0, "divide by zero");
return Integer(left.i / right.i);
}
const Integer
operator%(const Integer& left,
const Integer& right) {
require(right.i != 0, "modulo by zero");
return Integer(left.i % right.i);
}
const Integer
operator^(const Integer& left,
const Integer& right) {
return Integer(left.i ^ right.i);
}
const Integer
operator&(const Integer& left,
const Integer& right) {
return Integer(left.i & right.i);
}
const Integer
operator|(const Integer& left,
const Integer& right) {
return Integer(left.i | right.i);
}
const Integer
operator<<(const Integer& left,
const Integer& right) {
return Integer(left.i << right.i);
}
const Integer
operator>>(const Integer& left,
const Integer& right) {
return Integer(left.i >> right.i);
}
// Assignments modify & return lvalue:
Integer& operator+=(Integer& left,
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const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i += right.i;
return left;
}
Integer& operator-=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i -= right.i;
return left;
}
Integer& operator*=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i *= right.i;
return left;
}
Integer& operator/=(Integer& left,
const Integer& right) {
require(right.i != 0, "divide by zero");
if(&left == &right) {/* self-assignment */}
left.i /= right.i;
return left;
}
Integer& operator%=(Integer& left,
const Integer& right) {
require(right.i != 0, "modulo by zero");
if(&left == &right) {/* self-assignment */}
left.i %= right.i;
return left;
}
Integer& operator^=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i ^= right.i;
return left;
}
Integer& operator&=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i &= right.i;
return left;
}
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Integer& operator|=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i |= right.i;
return left;
}
Integer& operator>>=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i >>= right.i;
return left;
}
Integer& operator<<=(Integer& left,
const Integer& right) {
if(&left == &right) {/* self-assignment */}
left.i <<= right.i;
return left;
}
// Conditional operators return true/false:
int operator==(const Integer& left,
const Integer& right) {