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D如何检查null
2022-07-02 10:00:00 【fqbqrr】
enum canBeNull(T) = is(typeof({
T t; t = null;}));
static assert(canBeNull!(Object));
static assert(!canBeNull!(int));
我这样,可重载opAssign和opCmp.
我检查static if(is(typeof(null) : T))(可隐式转换为T),或用__traits(compiles, v is null)更好.
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