所以从这个角度来想,上边例子使用reinterpret_cast从const int * 到FunctionPointer转换就变得合理了,因为它并没有去除const限定
一、C 风格(C-style)强制转型如下: (T) expression // cast expression to be of type T 函数风格(Function-style)强制转型使用这样的语法: T(expression) // cast expression to be of type T 这两种形式之间没有本质上的不同,它纯粹就是一个把括号放在哪的问题。我把这两种形式称为旧风格(old-style)...
I'm still think about some safe conversion of that pointers and wrote little code that make some conversions using void pointer and return void from function. then is static_cast conversion to needed format. I was think about that void, because it can handle anything, if you don't kn...
->i = v; // OK as long as the type object isn't const } }; int main(){ [[maybe_unused]] void (type::*pmf)(int) const = &type::f; // pointer to member function // const_cast<void(type::*)(int)>(pmf); // compile error: const_cast does // not work on function ...
The following sample creates the base class (struct A) pointer, to an object (struct C). This, plus the fact there are virtual functions, enables runtime polymorphism. The sample also calls a nonvirtual function in the hierarchy. C++
然后function(static_cast(ref_b))就通过了!因为从编译器的角度来看,在编译时并不能知道ref_b实际上是c! 而function(dynamic_cast(ref_b))编译时也能过,但在运行时就失败了,因为dynamic_cast在运行时检查了ref_b的实际类型,这样怎么也骗不过去了。 在应用多态编程...
一、C风格(C-style)强制转型如下: (T)expression//castexpressiontobeoftypeT 函数风格(Function-style)强制转型使用这样的语法: T(expression)//castexpressiontobeoftypeT 这两种形式之间没有本质上的不同,它纯粹就是一个把括号放在哪的问题。我把这两种形式称为旧风格(old-style)的强制转型。
A pointer to a data object or to a function (but not a pointer to member) can be converted to any integer type large enough to contain it. (Typelongis always large enough to contain a pointer value on the architectures supported by the C++ compiler.) When converted back to the original...
1) C 风格(C-style)强制转型: (T) exdivssion // cast exdivssion to be of type T 2) 函数风格(Function-style)强制转型使用这样的语法: T(exdivssion) // cast exdivssion to be of type T 上面两种形式之间没有本质上的不同,它纯粹就是一个把括号放在哪的问题,我们把这两种形式称为旧风格(old...
C 风格(C-style)强制转型例如以下: (T) exdivssion // cast exdivssion to be of type T 函数风格(Function-style)强制转型使用这种语法: T(exdivssion) // cast exdivssion to be of type T 这两种形式之间没有本质上的不同,它纯粹就是一个把括号放在哪的问题。我把这两种形式称为旧风格(old-style...