Visible only within the project for nested classes , within the enclosing class 僅在項(xiàng)目內(nèi)可見(對于嵌套的類,在包含類內(nèi)可見)
An explicit specialization shall be declared in the namespace of which the template is a member , or , for member templates , in the namespace of which the enclosing class or enclosing class template is a member 一個(gè)顯式的特化應(yīng)該聲明在它所在的名域中,對于成員模板來說,應(yīng)該在聲明于它所嵌的類所在的名域中。