考虑这个片段:
#include <vector>
#include <algorithm>
#include <boost/function.hpp>
#include <boost/bind.hpp>
template<typename PODType>
class SomeClass
{
public:
SomeClass() : m_pred(boost::bind(&SomeClass<PODType>::someMethodA, this, _1))
{
}
bool someMethodA(const PODType& elem)
{
return false;
}
bool someMethodB(const std::vector<PODType>& vec)
{
return (std::find_if(vec.begin(), vec.end(), m_pred(_1)) != vec.end());
}
private:
boost::function<bool(PODType)> m_pred;
};
int main(int argc, char* argv[])
{
SomeClass<int> obj;
std::vector<int> v;
obj.someMethodB(v);
return 0;
}
编译器给出
error: no match for call to '(boost::function<bool(int)>) (boost::arg<1>&)'
note: no known conversion for argument 1 from 'boost::arg<1>' to 'int'
为线return (std::find_if(vec.begin(), vec.end(), m_pred(_1)));
我正在尝试someMethodA
在成员谓词中进行find_if
调用。