Hi3519使用c++ future 模板问题_问答

1，源码
#include
#include
#include
#include
#include
#include

std::uint32_t add(std::uint32_t a, std::uint32_t b)
{
  std::cout << "thread id = " << std::this_thread::get_id() << ", a = " << a << ", b = " << b << std::endl;
  if(std::numeric_limits::max() - a < b) {
throw std::overflow_error("overflow_error");
  }
  return a + b;
}

int main()
{
  // 使用std::async启动异步操作并返回std::future对象
  std::future f1 = std::async(std::launch::async, add, 1ul, 2ul);
  // 通过std::future::get等待异步操作完成并取得返回值
  std::uint32_t sum1 = f1.get();
  std::cout << "thread id = " << std::this_thread::get_id() << ", sum1 = " << sum1 << std::endl;
  // 4000000000ul + 4000000000ul会抛出异常，异常会被延迟到std::future::get或std::future::wait时抛出
  std::future f2 = std::async(std::launch::async, add, 4000000000ul, 4000000000ul);
  try {
std::uint32_t sum2 = f2.get();
std::cout << "thread id = " << std::this_thread::get_id() << ", sum2 = " << sum2 << std::endl;
  }
  catch(const std::overflow_error& e) {
std::cout << "thread id = " << std::this_thread::get_id() << ", e.what() = " << e.what() << std::endl;
  }
}

2，Ubuntu 上编译 g++ -o testfure2 testfuture2.cpp -std=c++11 -lpthread  通过，运行正常；

3，hisi3519 使用arm-hisiv600-linux-g++ -o testfure2 testfuture2.cpp -std=c++11 -lpthread

testfuture2.cpp: In function ‘int main()’:
testfuture2.cpp:20:32: error: variable ‘std::future f1’ has initializer but incomplete type
   std::future f1 = std::async(std::launch::async, add, 1ul, 2ul);
                              ^
testfuture2.cpp:20:81: error: invalid use of incomplete type ‘class std::future’
   std::future f1 = std::async(std::launch::async, add, 1ul, 2ul);
                                                                              ^
In file included from testfuture2.cpp:2:0:
/opt/hisi-linux/x86-arm/arm-hisiv600-linux/arm-hisiv600-linux-gnueabi/include/c++/4.9.4/future:114:11: error: declaration of ‘class std::future’
   class future;
         ^
testfuture2.cpp:25:32: error: variable ‘std::future f2’ has initializer but incomplete type
   std::future f2 = std::async(std::launch::async, add, 4000000000ul, 4000000000ul);
                              ^
testfuture2.cpp:25:99: error: invalid use of incomplete type ‘class std::future’
   std::future f2 = std::async(std::launch::async, add, 4000000000ul, 4000000000ul);
                                                                                                ^
In file included from testfuture2.cpp:2:0:
/opt/hisi-linux/x86-arm/arm-hisiv600-linux/arm-hisiv600-linux-gnueabi/include/c++/4.9.4/future:114:11: error: declaration of ‘class std::future’
   class future;
         ^
出现以上错误！？

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Hi3519使用c++ future 模板问题

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