forked from OSchip/llvm-project
Semantic analysis for non-type template parameter declarations.
llvm-svn: 64223
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clang
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@ -493,6 +493,8 @@ DIAG(note_template_nontype_parm_different_type, NOTE,
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"template non-type parameter has a different type %0 in template argument")
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DIAG(note_template_nontype_parm_prev_declaration, NOTE,
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"previous non-type template parameter with type %0 is here")
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DIAG(err_template_nontype_parm_bad_type, ERROR,
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"a non-type template parameter cannot have type %0")
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// C++ Template Argument Lists
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DIAG(err_template_arg_list_different_arity, ERROR,
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@ -161,6 +161,41 @@ Sema::DeclTy *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
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PrevDecl);
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}
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// C++ [temp.param]p4:
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//
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// A non-type template-parameter shall have one of the following
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// (optionally cv-qualified) types:
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//
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// -- integral or enumeration type,
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if (T->isIntegralType() || T->isEnumeralType() ||
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// -- pointer to object or pointer to function,
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T->isPointerType() ||
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// -- reference to object or reference to function,
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T->isReferenceType() ||
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// -- pointer to member.
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T->isMemberPointerType() ||
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// If T is a dependent type, we can't do the check now, so we
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// assume that it is well-formed.
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T->isDependentType()) {
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// Okay: The template parameter is well-formed.
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}
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// C++ [temp.param]p8:
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//
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// A non-type template-parameter of type "array of T" or
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// "function returning T" is adjusted to be of type "pointer to
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// T" or "pointer to function returning T", respectively.
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else if (T->isArrayType())
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// FIXME: Keep the type prior to promotion?
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T = Context.getArrayDecayedType(T);
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else if (T->isFunctionType())
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// FIXME: Keep the type prior to promotion?
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T = Context.getPointerType(T);
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else {
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Diag(D.getIdentifierLoc(), diag::err_template_nontype_parm_bad_type)
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<< T;
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return 0;
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}
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NonTypeTemplateParmDecl *Param
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= NonTypeTemplateParmDecl::Create(Context, CurContext, D.getIdentifierLoc(),
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Depth, Position, ParamName, T);
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@ -0,0 +1,27 @@
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// RUN: clang -fsyntax-only -verify %s
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class X;
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// C++ [temp.param]p4
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typedef int INT;
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enum E { enum1, enum2 };
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template<int N> struct A1;
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template<INT N, INT M> struct A2;
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template<enum E x, E y> struct A3;
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template<int &X> struct A4;
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template<int *Ptr> struct A5;
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template<int (&f)(int, int)> struct A6;
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template<int (*fp)(float, double)> struct A7;
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template<int X::*pm> struct A8;
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template<float (X::*pmf)(float, int)> struct A9;
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template<typename T, T x> struct A10;
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template<float f> struct A11; // expected-error{{a non-type template parameter cannot have type 'float'}}
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// C++ [temp.param]p8
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template<int X[10]> struct A5;
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template<int f(float, double)> struct A7;
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