尝试插入 std::set 时出现“'operator<' 不匹配"
我正在使用 gcc 4.3.3 尝试编译以下代码:
I'm using gcc 4.3.3 to try to compile the following code:
struct testStruct {
int x;
int y;
bool operator<(testStruct &other) { return x < other.x; }
testStruct(int x_, int y_) {
x = x_;
y = y_;
}
};
int main() {
multiset<testStruct> setti;
setti.insert(testStruct(10,10));
return 0;
}
我收到此错误:
/usr/include/c++/4.4/bits/stl_function.h|230|错误:在‘__x <’中不匹配‘operator<’__y'
我怀疑我没有像应该做的那样做运算符重载,但我无法查明确切的问题.我在这里做错了什么?
I get this error:
/usr/include/c++/4.4/bits/stl_function.h|230|error: no match for ‘operator<’ in ‘__x < __y’
I suspect I'm not doing the the operator overloading as it should be done, but I just can't pinpoint the exact problem. What am I doing wrong here?
推荐答案
操作符必须是 const 并取 const 引用:
The operator must be const and take a const reference:
bool operator<(const testStruct &other) const { return x < other.x; }
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