如何解决不支持的C++ 11代码

我学校的编译器似乎不支持C++ 11，但我不确定如何解决此问题。我也不确定是什么导致了最后一次编译器错误。我试图在Linux上编译：如何解决不支持的C++ 11代码

gcc -std=c++0x project2.cpp

系统无法识别-std = C++ 11。任何想法如何让它编译？谢谢！

#include <thread> 
#include <cinttypes> 
#include <mutex> 
#include <iostream> 
#include <fstream> 
#include <string> 
#include "time_functions.h" 
using namespace std; 

#define RING_BUFFER_SIZE 10 
class lockled_ring_buffer_spsc 
{ 
private: 
    int write = 0; 
    int read = 0; 
    int size = RING_BUFFER_SIZE; 
    string buffer[RING_BUFFER_SIZE]; 
    std::mutex lock; 
public: 

    void push(string val) 
    { 
     lock.lock(); 
     buffer[write%size] = val; 
     write++; 
     lock.unlock(); 
    } 

    string pop() 
    { 
     lock.lock(); 
     string ret = buffer[read%size]; 
     read++; 
     lock.unlock(); 
     return ret; 
    } 
}; 

int main(int argc, char** argv) 
{ 
    lockled_ring_buffer_spsc queue; 

    std::thread write_thread([&]() { 
     start_timing(); 
     string line; 
     ifstream myfile("p2-in.txt"); 
     if (myfile.is_open()) 
     { 
      while (getline(myfile, line)) 
      { 
       line += "\n"; 
       queue.push(line); 
       cout << line << " in \n"; 
      } 
      queue.push("EOF"); 


      myfile.close(); 
      stop_timing(); 


     } 

    } 
    ); 
    std::thread read_thread([&]() { 
     ofstream myfile; 
     myfile.open("p2-out.txt", std::ofstream::out | std::ofstream::trunc); 
     myfile.clear(); 
     string tmp; 
     while (1) 
     { 

      if (myfile.is_open()) 
      { 
       tmp=queue.pop(); 

       cout << tmp << "out \n"; 
       if (tmp._Equal("EOF")) 
        break; 

       myfile << tmp; 
      } 
      else cout << "Unable to open file"; 
     } 
     stop_timing(); 
     myfile.close(); 
    } 
    ); 

    write_thread.join(); 
    read_thread.join(); 
    cout << "Wall clock diffs:" << get_wall_clock_diff() << "\n"; 
    cout << "CPU time diffs:" << get_CPU_time_diff() << "\n"; 

    system("pause"); 

    return 0; 
}

编译器错误：

project2.cpp:14:14: sorry, unimplemented: non-static data member initializers 
project2.cpp:14:14: error: ISO C++ forbids in-class initialization of non-const static member ‘write’ 
project2.cpp:15:13: sorry, unimplemented: non-static data member initializers 
project2.cpp:15:13: error: ISO C++ forbids in-class initialization of non-const static member ‘read’ 
project2.cpp:16:13: sorry, unimplemented: non-static data member initializers 
project2.cpp:16:13: error: ISO C++ forbids in-class initialization of non-const static member ‘size’ 
project2.cpp: In lambda function: 
project2.cpp:79:13: error: ‘std::string’ has no member named ‘_Equal’

来源

2017-10-13 ctseng

与此问题无关，但请避免手动锁定和解锁互斥锁。遵循RAII范例，改为使用'std :: unique_lock'或'std :: lock_guard'。这样，你就不会忘记解锁你的互斥锁，并且在异常情况下你可以防止锁泄漏。 –

显示的错误很简单，只需将初始化移动到构造函数即可。但是你使用''库，它根本就不存在，不能被“固定” –

std :: string在任何标准中都没有叫_Equal的成员，你可以使用==操作符。 – Eelke

，你可以通过初始化成员更换

class lockled_ring_buffer_spsc 
{ 
private: 
    int write = 0; 
    int read = 0; 
    int size = RING_BUFFER_SIZE; 
    string buffer[RING_BUFFER_SIZE]; 
    std::mutex lock; 
public:

（除了静态数组）+默认的构造函数

class lockled_ring_buffer_spsc 
{ 
private: 
    int write; 
    int read; 
    int size; 
    string buffer[RING_BUFFER_SIZE]; 
    //std::mutex lock; 
public: 
    lockled_ring_buffer_spsc() : write(0),read(0),size(RING_BUFFER_SIZE) 
    {}

和

if (tmp._Equal("EOF"))

简直是

if (tmp == "EOF")

正如有人指出的那样，只有std::mutex在C++ 11引入了您必须使用普通的C pthread_mutex_lock/pthread_mutex_unlock功能实例。

来源

2017-10-13 17:59:28

'std :: mutex'是一个C++ 11功能。 –

@FrançoisAndrieux在日志中没有看到这个错误，但你是对的。我记得在我编写C++ 03之前使用'pthread'库。 –

奇怪的是，您的编译器不会抱怨std::mutex，这是一个C++ 11功能，但抱怨其他C++ 11功能。

线条

int write = 0; 
int read = 0; 
int size = RING_BUFFER_SIZE;

在C++ 11级但不是以前的版本有效。你可以在构造函数中初始化它们。

class lockled_ring_buffer_spsc 
{ 
private: 
    int write; 
    int read; 
    int size; 
    string buffer[RING_BUFFER_SIZE]; 
    std::mutex lock; 
public: 
    lockled_ring_buffer_spsc() : write(0), read(0), size(RING_BUFFER_SIZE) {} 

... 

};

，因为编译器在预C++ 11版本支持std::mutex这将只要工作。如果情况并非如此，则必须单独找到解决该问题的解决方案。

来源

2017-10-13 18:06:24

如何解决不支持的C++ 11代码

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