[PATCH] D73155: [Concepts] Implement P1616R1 - Using unconstrained template template parameters with constrained templates

[Saar Raz via Phabricator via cfe-commits]

saar.raz created this revision.
saar.raz added a reviewer: rsmith.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Allow unconstrained template template parameters to accept constrainted templates as arguments.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D73155

Files:
  clang/lib/Sema/SemaTemplate.cpp
  clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp


Index: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp
===================================================================
--- clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp
+++ clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp
@@ -7,9 +7,9 @@
 // expected-note at -1{{similar constraint expressions not considered equivalent}}
 template<template<C> class P> struct S1 { }; // expected-note 2{{'P' declared here}}
 
-template<C> struct X { }; // expected-note{{'X' declared here}}
+template<C> struct X { };
 
-template<D> struct Y { }; // expected-note 2{{'Y' declared here}}
+template<D> struct Y { }; // expected-note{{'Y' declared here}}
 template<typename T> struct Z { };
 template<F> struct W { }; // expected-note{{'W' declared here}}
 
@@ -18,10 +18,10 @@
 S1<Z> s13;
 S1<W> s14; // expected-error{{template template argument 'W' is more constrained than template template parameter 'P'}}
 
-template<template<typename> class P> struct S2 { }; // expected-note 2{{'P' declared here}}
+template<template<typename> class P> struct S2 { };
 
-S2<X> s21; // expected-error{{template template argument 'X' is more constrained than template template parameter 'P'}}
-S2<Y> s22; // expected-error{{template template argument 'Y' is more constrained than template template parameter 'P'}}
+S2<X> s21;
+S2<Y> s22;
 S2<Z> s23;
 
 template <template <typename...> class C>
Index: clang/lib/Sema/SemaTemplate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplate.cpp
+++ clang/lib/Sema/SemaTemplate.cpp
@@ -7164,6 +7164,11 @@
       //   [temp.constr.order].
       SmallVector<const Expr *, 3> ParamsAC, TemplateAC;
       Params->getAssociatedConstraints(ParamsAC);
+      // C++2a[temp.arg.template]p3
+      //   [...] In this comparison, if P is unconstrained, the constraints on A
+      //   are not considered.
+      if (ParamsAC.empty())
+        return false;
       Template->getAssociatedConstraints(TemplateAC);
       bool IsParamAtLeastAsConstrained;
       if (IsAtLeastAsConstrained(Param, ParamsAC, Template, TemplateAC,


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