我刚开始铿锵玩弄，并试图编译下面的示例程序：
#include <memory>
#include <iostream>
int main()
{
std::unique_ptr<unsigned> u(new unsigned(10));
std::cout << *u << std::endl;
return 0;
}
当我编译，我得到以下错误：
$ clang++ helloworld.cpp
helloworld.cpp:6:10: error: no member named 'unique_ptr' in namespace 'std'
std::unique_ptr<unsigned> u(new unsigned(10));
~~~~~^
helloworld.cpp:6:29: error: expected '(' for function-style cast or type construction
std::unique_ptr<unsigned> u(new unsigned(10));
~~~~~~~~^
helloworld.cpp:6:31: error: use of undeclared identifier 'u'
std::unique_ptr<unsigned> u(new unsigned(10));
^
helloworld.cpp:7:19: error: use of undeclared identifier 'u'
std::cout << *u << std::endl;
^
4 errors generated.
我使用锵3.1在Mac OS X：
$ clang++ --version
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix
任何想法，为什么这不会编译？
