紧急 使用unordered_map错误

[sinat_28720171]

问题描述

包含头文件#include <unordered_map>后编译器报错，错误信息为：

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.

该错误来自文件：c++0x_warning.h中的

#ifndef _CXX0X_WARNING_H
#define _CXX0X_WARNING_H 1

#if __cplusplus < 201103L
#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.
#endif

#endif

求解决方案，谢谢！

[赵4老师]

编译命令行加-std=c++11

[QLU_minoz]

头文件加上
#include <tr1/unordered_map>

命名空间加上
using namespace std::tr1;

这样
#include <iostream>
#include <tr1/unordered_map>

using namespace std;
using namespace std::tr1;