将套接字函数bind()与libcxx一起使用的编译代码失败 [英] Compiling code that uses socket function bind() with libcxx fails

问题描述

我正在使用新的libcxx库，并且我有一个代码调用套接字函数bind().问题是，当我键入using namespace std;时，编译器会为以下代码给我一个错误:

I am using the new libcxx library and I have a code that calls the socket function bind(). The problem is that when I type using namespace std; the compiler gives me an error for the following code:

int res = bind(sockfd, (struct sockaddr *)&myAddr, sizeof(myAddr));

使用clang的错误(svn构建):

The error using clang (svn build):

error: no viable conversion from '__bind<int &, sockaddr *, unsigned long>' to 'int'
 int res = bind(sockfd, (struct sockaddr *)&myAddr, sizeof(myAddr));

我认为问题在于using namespace std;将标头<functional>中的功能std::bind()从标头<functional>带到范围(尽管标头不包括在内).当我使用使用整个命名空间std的第三方库时，我无法轻松地将类名更改为完全限定的名称.

I think that the problem is that using namespace std; brings the function std::bind() from the header <functional> to the scope (although the header is not included). As I am using a third party library that uses the entire namespace std I can't easily change the class names to fully qualified names.

我想知道这是库实现中的问题，还是C ++ 11中是否有一些新规则可能会破坏使用bind()的旧代码.任何对此的想法将不胜感激.

I was wondering whether this is a problem in the implementation of the library or whether there are some new rules in C++11 that might potentially break an old code that uses bind(). Any thoughts on this would be appreciated.

谢谢

罗马

推荐答案

在库的实现中这不是问题. C ++ 11引入了自己的 std::bind namespace std中的strong>函数，该函数用于将参数绑定到函数并支持一些高阶编程.

This isn't a problem in the implementation of the libraries. C++11 introduced its own std::bind function into namespace std, which is used to bind parameters to functions and support a bit of higher-order programming.

具有namespace std的原因是为了帮助防止新的库函数和类引起对现有代码的重大更改.这样做的原因是，所有内容的名称都以std::开头，这样可以防止名称冲突.

The reason for having namespace std is to help prevent new library functions and classes from causing breaking changes in existing code. The reason for this is that everything has a name starting with std::, which prevents name collisions.

但是，如果您在程序中编写using namespace std;，则您将面临这种潜在的重大变化，因为自由功能bind和功能std::bind不一定能消除歧义.

However, if you write using namespace std; in your program, you're exposing yourself to potential breaking changes like this one, since the free function bind and the function std::bind can't necessarily be disambiguated.

要解决此问题，可以将bind作为::bind调用，以表明它位于全局名称空间中，或者可以删除程序顶部的using namespace std;.

To fix this, you can call bind as ::bind to make clear that it's in the global namespace, or you can remove the using namespace std; at the top of the program.

希望这会有所帮助！

这篇关于将套接字函数bind()与libcxx一起使用的编译代码失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！