delete/newoperator operatornew/delete operatornew[]/delete[] placementnew/delete

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<span style="color:#CC0000;">A:placement new/delete placement new[]/delete[]:</span>inline _LIBCPP_INLINE_VISIBILITY void* operator new  (std::size_t, void* __p) _NOEXCEPT {return __p;}inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;}inline _LIBCPP_INLINE_VISIBILITY void  operator delete  (void*, void*) _NOEXCEPT {}inline _LIBCPP_INLINE_VISIBILITY void  operator delete[](void*, void*) _NOEXCEPT {}<span style="color:#CC0000;">B:operator new/delete:</span>void* operator new(std::size_t size);                                   // replaceablevoid* operator new(std::size_t size, std::align_val_t alignment);       // replaceable, C++17void* operator new(std::size_t size, const std::nothrow_t&) noexcept;   // replaceablevoid* operator new(std::size_t size, std::align_val_t alignment,                   const std::nothrow_t&) noexcept;                     // replaceable, C++17void  operator delete(void* ptr) noexcept;                              // replaceablevoid  operator delete(void* ptr, std::size_t size) noexcept;            // replaceable, C++14void  operator delete(void* ptr, std::align_val_t alignment) noexcept;  // replaceable, C++17void  operator delete(void* ptr, std::size_t size,                      std::align_val_t alignment) noexcept;             // replaceable, C++17void  operator delete(void* ptr, const std::nothrow_t&) noexcept;       // replaceablevoid  operator delete(void* ptr, std:align_val_t alignment,                      const std::nothrow_t&) noexcept;                  // replaceable, C++17<span style="color:#CC0000;">C:operator new[]/delete[]:</span>void* operator new[](std::size_t size);                                 // replaceablevoid* operator new[](std::size_t size,                     std::align_val_t alignment) noexcept;              // replaceable, C++17void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceablevoid* operator new[](std::size_t size, std::align_val_t alignment,                     const std::nothrow_t&) noexcept;                   // replaceable, C++17void  operator delete[](void* ptr) noexcept;                            // replaceablevoid  operator delete[](void* ptr, std::size_t size) noexcept;          // replaceable, C++14void  operator delete[](void* ptr,                        std::align_val_t alignment) noexcept;           // replaceable, C++17void  operator delete[](void* ptr, std::size_t size,                        std::align_val_t alignment) noexcept;           // replaceable, C++17void  operator delete[](void* ptr, const std::nothrow_t&) noexcept;     // replaceablevoid  operator delete[](void* ptr, std::align_val_t alignment,                        const std::nothrow_t&) noexcept;                // replaceable, C++17<span style="color:#CC0000;">BC的实现:</span>void *operator new(std::size_t size) _THROW_BAD_ALLOC{    if (size == 0)        size = 1;    void* p;    while ((p = ::malloc(size)) == 0)    {        std::new_handler nh = std::get_new_handler();        if (nh)            nh();        else            throw std::bad_alloc();            break;    }    return p;}void *operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC{    if (size == 0)        size = 1;    if (static_cast<size_t>(alignment) < sizeof(void*))      alignment = std::align_val_t(sizeof(void*));    void* p;    while (::posix_memalign(&p, static_cast<size_t>(alignment), size) != 0)    {        std::new_handler nh = std::get_new_handler();        if (nh)            nh();        else {            throw std::bad_alloc();            p = nullptr; // posix_memalign doesn't initialize 'p' on failure            break;        }    }    return p;}void*operator new(size_t size, const std::nothrow_t&) _NOEXCEPT{    void* p = 0;    try    {        p = ::operator new(size);    }    catch (...)    {    }    return p;}void*operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT{    void* p = 0;    try    {        p = ::operator new(size, alignment);    }    catch (...)    {    }    return p;}void*operator new[](size_t size) _THROW_BAD_ALLOC{    return ::operator new(size);}void*operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC{    return ::operator new(size, alignment);}void*operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT{    void* p = 0;    try    {        p = ::operator new[](size);    }    catch (...)    {    }    return p;}void*operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT{    void* p = 0;    try    {        p = ::operator new[](size, alignment);    }    catch (...)    {    }    return p;}voidoperator delete(void* ptr) _NOEXCEPT{    if (ptr)        ::free(ptr);}voidoperator delete(void* ptr, std::align_val_t) _NOEXCEPT{    if (ptr)        ::free(ptr);}voidoperator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT{    ::operator delete(ptr);}voidoperator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT{    ::operator delete(ptr, alignment);} voidoperator delete(void* ptr, size_t) _NOEXCEPT{    ::operator delete(ptr);}voidoperator delete(void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT{    ::operator delete(ptr, alignment);}voidoperator delete[] (void* ptr) _NOEXCEPT{    ::operator delete(ptr);}voidoperator delete[] (void* ptr, std::align_val_t alignment) _NOEXCEPT{    ::operator delete(ptr, alignment);}voidoperator delete[] (void* ptr, const std::nothrow_t&) _NOEXCEPT{    ::operator delete[](ptr);}voidoperator delete[] (void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT{    ::operator delete[](ptr, alignment);}voidoperator delete[] (void* ptr, size_t) _NOEXCEPT{    ::operator delete[](ptr);}voidoperator delete[] (void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT{    ::operator delete[](ptr, alignment);}
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