[cpp] 关于模板

[ling]

c++编程思想的一道习题，下面的代码中，
HardLogic的compare函数会报错，但是SoftLogic的
compare函数却不报错，这是为什么呢？

class Noncomparable { };

struct HardLogic {
 Noncomparable nc1, nc2;
 void compare() {
  return nc1 = nc2;
 }
};

template<class T> struct SoftLogic {
 T nc1, nc2;
 void noOp() {}
 void compare() {
  return nc1 = nc2;
 }
};

int main()
{
 SoftLogic<Noncomparable> l;
 l.noOp();
}
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