The practice of declaring the Bind placeholders (_1, _2, …) in the global namespace is deprecated. Please use <boost/bind/bind.hpp> + using namespace boost::placeholders, or define BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.

• 提示warning的代码

#include <iostream>
#include <boost/bind.hpp>using namespace std;
using namespace boost;int fun(int x, int y) {return x+y;}
int main() {int m=1, n=2;cout << boost::bind(fun, _1, _2)(m, n) << endl;return 0;
}

• 消除warning

#include <iostream>
#include <boost/bind/bind.hpp>using namespace std;
using namespace boost::placeholders;int fun(int x, int y) {return x+y;}
int main() {int m=1, n=2;cout << boost::bind(fun, _1, _2)(m, n) << endl;return 0;
}

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