tmp/tmpk6g_96au/{from.md → to.md}
RENAMED
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@@ -13,16 +13,19 @@ definitions of members of the primary template are never used as
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definitions for members of a class template partial specialization. An
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explicit specialization of a member of a class template partial
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specialization is declared in the same way as an explicit specialization
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of the primary template.
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``` cpp
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// primary template
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template<class T, int I> struct A {
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void f();
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};
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template<class T, int I> void A<T,I>::f() { }
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// class template partial specialization
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template<class T> struct A<T,2> {
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void f();
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@@ -38,19 +41,18 @@ template<> void A<char,2>::h() { }
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int main() {
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A<char,0> a0;
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A<char,2> a2;
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a0.f(); // OK, uses definition of primary template's member
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-
a2.g();
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-
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a2.
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// explicit specialization's member
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a2.f(); // ill-formed, no definition of f for A<T,2>
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// the primary template is not used here
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}
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```
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If a member template of a class template is partially specialized, the
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member template partial specializations are member templates of the
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enclosing class template; if the enclosing class template is
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instantiated ([[temp.inst]], [[temp.explicit]]), a declaration for
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every member template partial specialization is also instantiated as
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@@ -62,10 +64,12 @@ specialization of the enclosing class template. If a partial
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specialization of the member template is explicitly specialized for a
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given (implicit) specialization of the enclosing class template, the
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primary member template and its other partial specializations are still
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considered for this specialization of the enclosing class template.
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``` cpp
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template<class T> struct A {
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template<class T2> struct B {}; // #1
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template<class T2> struct B<T2*> {}; // #2
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};
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@@ -75,5 +79,7 @@ template<> template<class T2> struct A<short>::B {}; // #3
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A<char>::B<int*> abcip; // uses #2
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A<short>::B<int*> absip; // uses #3
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A<char>::B<int> abci; // uses #1
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```
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definitions for members of a class template partial specialization. An
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explicit specialization of a member of a class template partial
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specialization is declared in the same way as an explicit specialization
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of the primary template.
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+
[*Example 1*:
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+
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``` cpp
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+
// primary class template
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template<class T, int I> struct A {
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void f();
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};
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+
// member of primary class template
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template<class T, int I> void A<T,I>::f() { }
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// class template partial specialization
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template<class T> struct A<T,2> {
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void f();
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int main() {
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A<char,0> a0;
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A<char,2> a2;
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a0.f(); // OK, uses definition of primary template's member
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a2.g(); // OK, uses definition of partial specialization's member
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a2.h(); // OK, uses definition of explicit specialization's member
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a2.f(); // ill-formed, no definition of f for A<T,2>; the primary template is not used here
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}
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```
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+
— *end example*]
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+
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If a member template of a class template is partially specialized, the
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member template partial specializations are member templates of the
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enclosing class template; if the enclosing class template is
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instantiated ([[temp.inst]], [[temp.explicit]]), a declaration for
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every member template partial specialization is also instantiated as
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specialization of the member template is explicitly specialized for a
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given (implicit) specialization of the enclosing class template, the
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primary member template and its other partial specializations are still
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considered for this specialization of the enclosing class template.
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[*Example 2*:
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``` cpp
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template<class T> struct A {
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template<class T2> struct B {}; // #1
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template<class T2> struct B<T2*> {}; // #2
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};
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A<char>::B<int*> abcip; // uses #2
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A<short>::B<int*> absip; // uses #3
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A<char>::B<int> abci; // uses #1
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```
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+
— *end example*]
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+
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