静态操作符重载模拟单位
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oldrev
2007-10-14
今天我在新闻组里用砖头引出来的，呵呵：
struct Mass {
private double m_value;
}
struct kg {
static Mass opMul_r(double value) { return Mass(value); }
}
struct g {
static Mass opMul_r(double value) { return Mass(value / 1000); }
}
void main() {
Mass m = 100*kg;
m = 1*g;
}
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oldrev
2007-10-16
忘了说，也可以不用操作符重载实现：
const Mass kg = Mass(1); const Mass g = Mass(0.001); Mass m = 100*kg; m = 1*g; |
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oldrev
2007-10-16
还有更变态的，用 static 操作符重载确保 struct 指针定义的正确性：
struct foo
{
static bool opMul(foo* x)
{ return true;}
}
void main()
{
foo* p;
assert(foo* p); // just checking that we declared p correctly
foo* null; // hey, look! null really can be an identifier
}
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