//筆記 實現** 僅摘取一部分 理解原理 不是完整的boost**
// 依賴的標頭檔案
// #include or #include // 實現原理
template struct add_const
;template struct add_const;
// add_const::type => int const
// add_const::type => int&
// add_const::type => int* const
// add_const::type => int const
// 依賴的標頭檔案
// #include or #include template struct add_cv;
template struct add_cv;
// add_cv::type => int const volatile
// add_cv::type => int&
// add_cv::type => int* const volatile
// add_cv::type => int const volatile
// 依賴的標頭檔案
// #include or #include template struct add_reference_impl
;template struct add_reference_impl;
template struct add_reference
;template struct add_reference;
template <> struct add_reference;
template <> struct add_reference;
template <> struct add_reference;
template <> struct add_reference;
// add_reference::type => int&
// add_reference::type => int const&
// add_reference::type => int*&
// add_reference::type => int*&
// 依賴的標頭檔案
// #include or #include template struct add_volatile;
template struct add_volatile;
// add_volatile::type => int volatile
// add_volatile::type => int&
// add_volatile::type => int* volatile
// add_volatile::type => int const volatile
// 依賴的標頭檔案
// #include or #include template struct add_pointer
;template struct add_pointer;
template struct add_pointer;
template struct add_pointer;
template struct add_pointer;
// add_pointer::type => int*
// add_pointer::type => int const*
// add_pointer::type => int**
// add_pointer::type => int**
// 依賴的標頭檔案
// #include or #include template struct add_lvalue_reference
;template struct add_lvalue_reference;
// add_lvalue_reference::type => int&
// add_lvalue_reference::type => int const&
// add_lvalue_reference::type => int*&
// add_lvalue_reference::type => int*&
// add_lvalue_reference::type => int&
// add_lvalue_reference::type => void
// 依賴的標頭檔案
// #include or #include template struct add_rvalue_reference_helper
;template struct add_rvalue_reference_helper;
template struct add_rvalue_reference_imp
;template struct add_rvalue_reference
;// add_rvalue_reference::type => int&&
// add_rvalue_reference::type => int const&
// add_rvalue_reference::type => int*&&
// add_rvalue_reference::type => int*&
// add_rvalue_reference::type => int&&
// add_rvalue_reference::type => void
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