Implement the conversion to a function pointer for lambda expressions,

per C++ [expr.prim.lambda]p6.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150236 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 25 insertions, 3 deletions

diff --git a/test/CXX/expr/expr.prim/expr.prim.lambda/p5.cpp b/test/CXX/expr/expr.prim/expr.prim.lambda/p5.cpp
index 9df0f64ad3..74003431c6 100644
--- a/test/CXX/expr/expr.prim/expr.prim.lambda/p5.cpp
+++ b/test/CXX/expr/expr.prim/expr.prim.lambda/p5.cpp
@@ -15,13 +15,13 @@ void test_quals() {
   // This function call operator is declared const (9.3.1) if and only
   // if the lambda- expression's parameter-declaration-clause is not
   // followed by mutable.
-  auto l = [](){}; // expected-note{{method is not marked volatile}}
+  auto l = [=](){}; // expected-note{{method is not marked volatile}}
   const decltype(l) lc = l;
   l();
   lc();
 
-  auto ml = []() mutable{}; // expected-note{{method is not marked const}} \
-                            // expected-note{{method is not marked volatile}} 
+  auto ml = [=]() mutable{}; // expected-note{{method is not marked const}} \
+                             // expected-note{{method is not marked volatile}} 
   const decltype(ml) mlc = ml;
   ml();
   mlc(); // expected-error{{no matching function for call to object of type}}
diff --git a/test/CXX/expr/expr.prim/expr.prim.lambda/p6.cpp b/test/CXX/expr/expr.prim/expr.prim.lambda/p6.cpp
new file mode 100644
index 0000000000..8b43cefa92
--- /dev/null
+++ b/test/CXX/expr/expr.prim/expr.prim.lambda/p6.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
+
+void test_conversion() {
+  int (*fp1)(int) = [](int x) { return x + 1; };
+  void (*fp2)(int) = [](int x) { };
+
+  const auto lambda = [](int x) { };
+  void (*fp3)(int) = lambda;
+
+  volatile const auto lambda2 = [](int x) { }; // expected-note{{but method is not marked volatile}}
+  void (*fp4)(int) = lambda2; // expected-error{{no viable conversion}}
+}
+
+void test_no_conversion() { 
+  int (*fp1)(int) = [=](int x) { return x + 1; }; // expected-error{{no viable conversion}}
+  void (*fp2)(int) = [&](int x) { }; // expected-error{{no viable conversion}}
+}
+
+void test_wonky() {
+  const auto l = [](int x) mutable -> int { return + 1; };
+  l(17); // okay: uses conversion function
+}