C ++ 0x lambda按值捕获总是const?
有什么方法可以按值捕获,并使捕获的值非常量?我有一个库函子,我想捕获 &调用一个非 const 但应该是的方法.
Is there any way to capture by value, and make the captured value non-const? I have a library functor that I would like to capture & call a method that is non-const but should be.
以下内容无法编译,但将 foo::operator() const 修复.
The following doesn't compile but making foo::operator() const fixes it.
struct foo
{
bool operator () ( const bool & a )
{
return a;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
foo afoo;
auto bar = [=] () -> bool
{
afoo(true);
};
return 0;
}
推荐答案
使用可变的.
auto bar = [=] () mutable -> bool ....
如果没有 mutable,您将声明 lambda 对象的 operator () const.
Without mutable you are declaring the operator () of the lambda object const.
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