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问题描述
我有指针的载体。我想呼吁每个元素的功能,但该功能需要一个参考。有没有一种简单的方法来解引用的元素?
I have a vector of pointers. I would like to call a function for every element, but that function takes a reference. Is there a simple way to dereference the elements?
例如:
MyClass::ReferenceFn( Element & e ) { ... }
MyClass::PointerFn( Element * e ) { ... }
MyClass::Function()
{
std::vector< Element * > elements;
// add some elements...
// This works, as the argument is a pointer type
std::for_each( elements.begin(), elements.end(),
boost::bind( &MyClass::PointerFn, boost::ref(*this), _1 ) );
// This fails (compiler error), as the argument is a reference type
std::for_each( elements.begin(), elements.end(),
boost::bind( &MyClass::ReferenceFn, boost::ref(*this), _1 ) );
}
我可以创建一个肮脏的小包装,需要一个指针,但我想必须有一个更好的办法?
I could create a dirty little wrapper that takes a pointer, but I figured there had to be a better way?
推荐答案
您可以使用的boost :: indirect_iterator
:
std::for_each( boost::make_indirect_iterator(elements.begin()),
boost::make_indirect_iterator(elements.end()),
boost::bind( &MyClass::ReferenceFn, boost::ref(*this), _1 ) );
这将间接引用其运算符*两次改编的迭代器
。
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