求向量的max元素,其中一个成员用于确定其最大值

boost max_element

struct A
{
    A(int n): x(n)
    {
    }
    int x;
};

using namespace std;
using namespace boost::lambda;

int main()
{
    vector<A> as;
    as.push_back(A(7));
    as.push_back(A(5));
    as.push_back(A(3));

    vector<A>::iterator iter = max_element(as.begin(), as.end(), bind(&A::x, _2) > bind(&A::x, _1));
    int max = iter->x;
}

std::max_element(as.begin(), as.end(),
    [](A a, A b){ return a.x < b.x; });

maxSoFar = *(as.begin());

http://www.cplusplus.com/reference/algorithm/max_element/

operator<

maxSoFar =  *(std::max_element(as.begin(), as.end()));