关于mem_fun,MSDN上的例子居然有编译错误!!!
#include "iostream"
#include "vector"
#include "algorithm"
#include "functional"
using namespace std;
struct B {
virtual void print() = 0;
};
struct D1 : public B {
void print() { cout << "I'm a D1" << endl; }
};
struct D2 : public B {
void print() { cout << "I'm a D2" << endl; }
};
void main()
{
vector<B*> V;
V.push_back(new D1);
V.push_back(new D2);
V.push_back(new D2);
V.push_back(new D1);
for_each(V.begin(), V.end(), mem_fun(&B::print));
}
--------------------Configuration: ThermalSys - Win32 Debug--------------------
Compiling...
ThermalSys.cpp
d:\microsoft visual studio\vc98\include\functional(233) : error C2562: '()' : 'void' function returning a value
d:\microsoft visual studio\vc98\include\functional(232) : see declaration of '()'
d:\microsoft visual studio\vc98\include\functional(233) : while compiling class-template member function 'void __thiscall std::mem_fun_t<void,class Heater>::operator ()(class Heater *) const'
Error executing cl.exe.
ThermalSys.obj - 1 error(s), 0 warning(s)
改怎么解决这个问题啊?
如果把void改为int编译通过。
另外我想问一下像在这个程序中,用new分配空间,最后不用delete吗?
难道是vector自动delete,不解???