问题描述

此程序在使用 VC12(在 Visual Studio 2013 RTM 中)编译时^[1] 导致崩溃(在所有构建配置中)，而实际上不应该:

This program, when compiled with VC12 (in Visual Studio 2013 RTM)^[1] leads to a crash (in all build configurations), when really it shouldn't:

#include <string>

void foo(std::string const& oops = {})
{
}

int main()
{
    foo();
}

我知道可能有两个无声的不良代码生成错误:

I know of two silent bad codegen bugs that might be related:

• https://connect.microsoft.com/VisualStudio/feedback/details/800364/initializer-list-calls-object-destructor-twice
• http://connect.microsoft.com/VisualStudio/feedback/details/800104/

老实说，我认为这些是不同的.有谁知道

Honestly I think these are different, though. Does anyone know

1. 是否存在针对此连接的主动跟踪错误
2. 是否有解决方法(或对导致此错误的情况的明确描述，以便我们可以在我们的代码库中查找/避免它)?

<小时>

^[1] 只需使用 C++ 控制台应用程序向导"创建一个空项目.为简单起见，禁用预编译头并保留所有默认值:http://i.stack.imgur.com/rrrnV.png

^[1] Just create an empty project using the C++ Console Application 'wizard'. For simplicity, disable precompiled headers and leave all defaults: http://i.stack.imgur.com/rrrnV.png

推荐答案

一个活动问题已在 11 月.发布的示例代码是:

An active issue was posted back in November. The sample code posted was:

Compile and run following code in VS2013

#include <string>

void f(std::string s = {}) {
}

int main(int argc, char* argv[]) {
    f();
    return 0;
}

微软已确认该错误.

那里似乎没有发布解决方法.编辑解决方法很容易基于避免列表初始化语法:

There doesn't seem to be a work-around posted there. Edit Workarounds can easily be based on avoiding the list-initializer syntax:

void f(std::string s = "");
void f(std::string s = std::string());
void f(std::string s = std::string {});

或者只是老式的(如果你不介意引入重载):

Or just the old-fashioned (if you don't mind introducing overloads):

void f(std::string s);
void f() { f(std::string()); }

这篇关于(已知)VC12 中的编译器错误?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跟版网！