首先,reinterpret_pointer_cast便于弱类型语言中的指针类型转换。它类似于C语言中的强制类型转换,但是相比之下更加安全,可以确保转换的指针的类型不会出问题。在某些情况下,reinterpret_pointer_cast可以把不同的指针类型当做同一种类型来用,这样就可以充分利用其弱类型运算提供的特性,大大减少编码的开发时间。 其次,reint...
它们的功能和std::static_cast()、std::dynamic_cast、std::const_cast()和std::reinterpret_cast()类似,只不过转换的是智能指针std::shared_ptr,返回的也是std::shared_ptr类型。 1、std::static_pointer_cast():当指针是智能指针时候,向上转换,用static_cast 则转换不了,此时需要使用static_pointer_cast。
(since C++11) template< class T, class U > std::shared_ptr<T> reinterpret_pointer_cast( const std::shared_ptr<U>& r ); (4) (since C++17) 创建一个新的实例。std::shared_ptr其存储的指针是从r%27s使用强制转换表达式存储指针。如果r是空的,新的也是空的shared_ptr%28但其存储的指针不一...
std::shared_ptr<T>reinterpret_pointer_cast(std::shared_ptr<U>&&r)noexcept; (8)(C++20 起) 创建std::shared_ptr的新实例,其存储指针从r的存储指针用转型表达式获得。 若r为空,则新的shared_ptr亦然(但其存储指针不必为空)。否则,新的shared_ptr将与r的初始值共享所有权,但若dynamic_pointer_cast所进...
Test output: FAIL: Clang :: Analysis/reinterpret-cast-pointer-to-member.cpp (1113 of 19841) *** TEST 'Clang :: Analysis/reinterpret-cast-pointer-to-member.cpp' FAILED *** Exit Code: 134 Command Output (s...
aConversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast 转换从缺一不可的类型向尖类型要求reinterpret_cast、C样式塑像或者作用样式塑像[translate]
UINT) noexcept; const auto hdll = ::GetModuleHandleA(“User32.dll”); const auto name = “MessageBoxW”; const auto func = ::GetProcAddress(hdll, name); msgbox = reinterpret_cast<decltype(msgbox)>(func); msgbox(nullptr, nullptr, nullptr, MB_OK); } but failed to cast, how do...
postfix-expr:= reinterpret_cast <type-id> (expression) Thereinterpret_castoperator performs potentially unsafe type casts. It is most often used to cast a pointer to a different pointer type. Casting a pointer to a different pointer and back is usually safe and yields the original value. The...
std::shared_ptr<T> const_pointer_cast( std::shared_ptr<U>&& r ) noexcept; (6) (C++20 起) template< class T, class U >std::shared_ptr<T> reinterpret_pointer_cast( const std::shared_ptr<U>& r ) noexcept; (7) (C++17 起) template< class T, class U >std::shared_ptr<T> ...
static_pointer_castdynamic_pointer_castconst_pointer_castreinterpret_pointer_cast (C++17) applies static_cast, dynamic_cast, const_cast, or reinterpret_cast to the stored pointer (function template) Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/experimental/shared_ptr/poin...