（已知）VC12中的编译器错误？ [英] (Known) compiler bug in VC12?

问题描述

当使用VC12（在Visual Studio 2013 RTM中） ^[1] 编译时，此程序导致崩溃（在所有版本配置中），但实际上不应该：

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();
}

我知道两个沉默的错误codegen错误 有关：

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 /

• 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，我认为这些不同。是否有人知道

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

1. 是否有


2. 一个解决方法（或者引起这个bug的情况的一个明确的描述，所以我们可以在代码库中查找/避免它）。

---

^[1] 只需使用C ++控制台应用程序向导创建一个空项目。为了简单起见，请停用预先编译的标题，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

活动问题已发布在 November 。发布的示例代码为：

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;
}

该错误已被Microsoft承认。

The bug has been acknowledged by Microsoft.

这里似乎没有一个工作。 修改解决方法很容易避免使用list-initializer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()); }

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