[英]stl sort comparison class function
我想将stl排序与greater
的类比较函数一起使用,该类比较函数使用infoVec1
和infoVec2
但是出现编译错误:
这是类头
class Compare{
Compare();
std::vector< std::vector<std::string> >& infoVec1;
std::vector< std::vector<std::string> >& infoVec2;
public:
bool greater(int one, int two);
Compare(std::vector< std::vector<std::string> >& info1,
std::vector< std::vector<std::string> >& info2);
};
我已经像这样在main中初始化了Compare:
Compare C = Compare(info1, info2);
而且我正在尝试使用main主要方法:
sort(vec.begin(), vec.end(), C.greater);
我收到此错误:
main.cpp:266: error: no matching function for call to ‘sort(__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, <unresolved overloaded function type>)’
/usr/include/c++/4.2.1/bits/stl_algo.h:2852: note: candidates are: void std::sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Compare = bool (Compare::*)(int, int)]
make: *** [main.o] Error 1
我如何解决这个问题,以便greater
可以与stl sort一起使用?
将Greater()方法更改为operator()()更容易。
class Compare{
Compare();
std::vector< std::vector<std::string> >& infoVec1;
std::vector< std::vector<std::string> >& infoVec2;
public:
bool operator()(int one, int two) const; // this is used automatically.
Compare(std::vector< std::vector<std::string> >& info1,
std::vector< std::vector<std::string> >& info2);
};
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