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#include <iostream>
#include <thread>
#include <mutex>
 
class Test {
public:
	typedef std::unique_lock<std::mutex> lock_t;
 
	Test()
		: m()
		, index() {
	}
	Test(const Test& other)
		: index(other.index) {
		std::cout << "copy\n";
	}
	~Test() {
	}
	lock_t getLock() {
		return lock_t(m);
	}
	void increment() {
		++index;
	}
	void disp() {
		std::cout << "index of " << index << '\n';
	}
 
private:
	std::mutex m;
	int index;
};
 
void foo(Test test) {
	for (int i=0; i<100; ++i)
		test.increment();
	test.disp();
}
 
void worker() {
	Test test;							// このインスタンスを
	Test::lock_t lk = test.getLock();	// ここでロック
	test.increment();					// コピー前にひとつインクリメント
	foo(test);							// ここでコピー
}
 
int main() {
	std::thread th1(worker);
	std::thread th2(worker);
	th1.join();
	th2.join();
	return 0;
}
/* 結果
	copy
	index of 101
	copy
	index of 101
*/

In file included from /usr/include/c++/4.8/thread:35:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
prog.cpp:7:10: error: ‘unique_lock’ in namespace ‘std’ does not name a type
  typedef std::unique_lock<std::mutex> lock_t;
          ^
prog.cpp:19:2: error: ‘lock_t’ does not name a type
  lock_t getLock() {
  ^
prog.cpp:30:2: error: ‘mutex’ in namespace ‘std’ does not name a type
  std::mutex m;
  ^
prog.cpp: In constructor ‘Test::Test()’:
prog.cpp:10:5: error: class ‘Test’ does not have any field named ‘m’
   : m()
     ^
prog.cpp: In function ‘void worker()’:
prog.cpp:42:2: error: ‘lock_t’ is not a member of ‘Test’
  Test::lock_t lk = test.getLock(); // ここでロック
  ^
prog.cpp:42:15: error: expected ‘;’ before ‘lk’
  Test::lock_t lk = test.getLock(); // ここでロック
               ^
prog.cpp: In function ‘int main()’:
prog.cpp:48:2: error: ‘thread’ is not a member of ‘std’
  std::thread th1(worker);
  ^
prog.cpp:48:14: error: expected ‘;’ before ‘th1’
  std::thread th1(worker);
              ^
prog.cpp:49:2: error: ‘thread’ is not a member of ‘std’
  std::thread th2(worker);
  ^
prog.cpp:49:14: error: expected ‘;’ before ‘th2’
  std::thread th2(worker);
              ^
prog.cpp:50:2: error: ‘th1’ was not declared in this scope
  th1.join();
  ^
prog.cpp:51:2: error: ‘th2’ was not declared in this scope
  th2.join();
  ^

Standard output is empty