[英]EXC_BAD_ACCESS when using std::function w/ std::bind
After upgrading to XCode 5 using std::function with std::bind appears to be generating EXC_BAD_ACCESS exceptions. 使用带有std :: bind的std :: function升级到XCode 5后,似乎会生成EXC_BAD_ACCESS异常。 It looks as if the __base pointer inside the implementation of std::function ends up being null, resulting in the bad access, but I'm not clear on why that would be the case.
看起来std :: function实现中的__base指针最终为null,导致访问不良,但我不清楚为什么会出现这种情况。 Does anyone have an insight into either what I'm doing wrong?
有没有人能够洞察我做错了什么?
Here is sample code that illustrates the problem. 以下是说明问题的示例代码。
struct A
{
void foo(bool b)
{
std::cout << b << std::endl;
}
void go()
{
// ok
auto a = std::bind(&A::foo, this, std::placeholders::_1);
a(true);
// ok
std::function<void(A*, bool)> b = std::bind(&A::foo, std::placeholders::_1, std::placeholders::_2);
b(this, true);
// ok
std::function<void(A*, bool)> c = std::bind(&A::foo, this, std::placeholders::_2);
c(this, true);
// EXC_BAD_ACCESS
std::function<void(bool)> f = std::bind(&A::foo, this, std::placeholders::_1);
f(true);
}
};
...
...
A a;
a.go();
It seems that this may be a bug that has been fixed. 看来这可能是一个已修复的错误。 I had a similar issue ( std::bind to a std::function crashes with Clang ) where the solution simply was to upgrade from XCode 5.0.1 to XCode 5.0.2.
我有一个类似的问题( std :: bind到std :: function与Clang崩溃 ),解决方案只是从XCode 5.0.1升级到XCode 5.0.2。
I tried your code and it seems to work fine with XCode 5.0.2 (have not tried with 5.0.1). 我尝试了你的代码,它似乎与XCode 5.0.2(没有尝试使用5.0.1)工作正常。
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