在msbuild中取得system32位置，不分64還是32位元windows

<PropertyGroup>
  <X64SystemDir>$(SystemRoot)\Sysnative</X64SystemDir>
  <X32SystemDir>$(SystemRoot)\System32</X32SystemDir>
</PropertyGroup>

<Choose>
  <When Condition="Exists('$(X64SystemDir)')">
    <PropertyGroup>
      <SystemDir>$(X64SystemDir)</SystemDir>
    </PropertyGroup>
  </When>
  <Otherwise>
    <PropertyGroup>
      <SystemDir>$(X32SystemDir)</SystemDir>
    </PropertyGroup>
  </Otherwise>
</Choose>

C++11: make_shared<T>()

Sample:

#include <memory>
#include <iostream>
 
using namespace std;
 
class MyClass{
public:
	int m_i;
	MyClass(int i):m_i(i){  cout << "constructor" << endl;
	}
	~MyClass(){
		cout << "destructor" << endl;
	}
};
 
void _tmain(int argc, _TCHAR* argv[])
{
	cout << "enter main" << endl;
	auto a = make_shared<MyClass>(10);
	cout << a->m_i << endl;
	cout << "leave main" << endl;
}

output:

enter main

constructor

10

leave main

destructor