Boost lambda::_1 in C++ 0x

int main() 
{ 
    std::vector<int> v; 
    v.push_back(1); 
    v.push_back(3); 
    v.push_back(2); 

    std::for_each(v.begin(), v.end(), std::cout << boost::lambda::_1 << "\n");开发者_高级运维
} 

Can this code be translated to C++ without using Boost? I know C++ 0x lambda expression syntax, but didn't try to use placeholders in such context.

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No placeholder needed in this case, as lambdas capture the parameter:

std::for_each(v.begin(), v.end(), [](int x){std::cout << x << "\n";});