定位new表达式
#include <iostream> #include <new> using namespace std; const int chunk = 16; class Foo{ public: int val() { return __val; } Foo() { __val = 0; } private: int __val; }; char *buf = new char[sizeof(Foo) * chunk]; int main(int argc, char* argv[]) { Foo *pb = new (buf)Foo; if (pb->val() == 0) { cout << "new expression worked!" << endl; } delete [] buf; return 0; }