使用别名声明与VC ++ 11 [英] Using alias declaration with VC++ 11

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本文介绍了使用别名声明与VC ++ 11的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

下面的代码示例使用别名声明新的C ++ 11无法编译与VC ++ 11,更新1在VS2012并发出包含的错误。它使用 g ++ -std = c ++ 11 -Wall in.cpp 在Windows 7上的MinGW下编译和执行GCC 4.7.2。 b
$ b

我没有找到任何迹象表明这是不支持。此外,IntelliSense不会拾取任何错误,并显示 cdptr 类型的工具提示 typedef const double * cdptr 。我的项目设置为使用v110平台工具集,并编译为C ++代码。



我错了Microsoft?

  #include< iostream> 

int main()
{
使用cdptr = const double *;

const double pi = 3.14159;
cdptr cdp =& pi;

std :: cout<< cdp:<< (* cdp)<< std :: endl;

return 0;
}

生成输出:

  1> ------构建开始:项目:AliasDeclTest,配置:调试Win32 ------ 
1> AliasDeclTest.cpp
1> f:\aliasdecltest\aliasdecltest.cpp(9):错误C2143:语法错误:缺少';'before'='
1> f:\aliasdecltest\ aliasdecltest.cpp(9):错误C2873:'cdptr':符号不能用于声明
1> f:\aliasdecltest\aliasdecltest.cpp(12):error C2065:'cdptr':未声明的标识符
1> f:\aliasdecltest\aliasdecltest.cpp(12):错误C2146:语法错误:在标识符'cdp'之前缺少';'
1> f:\aliasdecltest\ aliasdecltest.cpp(12):error C2065:'cdp':undeclared identifier
1> f:\aliasdecltest\aliasdecltest.cpp(14):error C2065:'cdp':undeclared identifier
= ========= Build:0成功,1失败,0最新,0跳过==========
November CTP ,

您可以找到 C ++ 11 支持这里


Following code example using alias declaration new in C++11 fails to compile with VC++ 11, update 1 in VS2012 and emits included errors. It compiles and executes without a peep with GCC 4.7.2 under MinGW on Windows 7 using g++ -std=c++11 -Wall in.cpp.

I didn't find any indications that this isn't supported. Furthermore, IntelliSense doesn't pick up any errors and displays a tooltip for cdptr type that says typedef const double *cdptr. My project is set to use v110 platform toolset and compile as C++ code.

How have I wronged Microsoft?

#include <iostream>

int main()
{
    using cdptr = const double*;

    const double pi = 3.14159;
    cdptr cdp = &pi;

    std::cout << "cdp: " << (*cdp) << std::endl;

    return 0;
}

Build output:

1>------ Build started: Project: AliasDeclTest, Configuration: Debug Win32 ------
1>  AliasDeclTest.cpp
1>f:\aliasdecltest\aliasdecltest.cpp(9): error C2143: syntax error : missing ';' before '='
1>f:\aliasdecltest\aliasdecltest.cpp(9): error C2873: 'cdptr' : symbol cannot be used in a using-declaration
1>f:\aliasdecltest\aliasdecltest.cpp(12): error C2065: 'cdptr' : undeclared identifier
1>f:\aliasdecltest\aliasdecltest.cpp(12): error C2146: syntax error : missing ';' before identifier 'cdp'
1>f:\aliasdecltest\aliasdecltest.cpp(12): error C2065: 'cdp' : undeclared identifier
1>f:\aliasdecltest\aliasdecltest.cpp(14): error C2065: 'cdp' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

解决方案

MSVC11, even with the November CTP, does not implement using alias declarations.

You can find a table of C++11 support here.

这篇关于使用别名声明与VC ++ 11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!

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