尝试插入到std :: set时,“与'operator<'不匹配" [英] “no match for 'operator<'” when trying to insert to a std::set
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问题描述
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<__y’
我怀疑我没有像应该做的那样做运算符重载,但我只是无法指出确切的问题.我在这里做什么错了?
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
运算符必须为const并采用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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