First pass of semantic analysis for init-captures: check the initializer, build
a FieldDecl from it, and propagate both into the closure type and the
LambdaExpr.
You can't do much useful with them yet -- you can't use them within the body
of the lambda, because we don't have a representation for "the this of the
lambda, not the this of the enclosing context". We also don't have support or a
representation for a nested capture of an init-capture yet, which was intended
to work despite not being allowed by the current standard wording.
llvm-svn: 181985
diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p11-1y.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p11-1y.cpp
new file mode 100644
index 0000000..0eec331
--- /dev/null
+++ b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p11-1y.cpp
@@ -0,0 +1,84 @@
+// RUN: %clang_cc1 -std=c++1y %s -verify
+
+// For every init-capture a non-static data member named by the identifier of
+// the init-capture is declared in the closure type.
+const char *has_member_x = [x("hello")] {}.x;
+// This member is not a bit-field...
+auto capturing_lambda = [n(0)] {};
+int decltype(capturing_lambda)::*mem_ptr = &decltype(capturing_lambda)::n;
+// ... and not mutable.
+const auto capturing_lambda_copy = capturing_lambda;
+int &n = capturing_lambda_copy.n; // expected-error {{drops qualifiers}}
+
+// The type of that member [...is that of a...] variable declaration of the form
+// "auto init-capture ;"...
+auto with_float = [f(1.0f)] {};
+float &f = with_float.f;
+// ... except that the variable name is replaced by a unique identifier.
+auto with_float_2 = [&f(f)] {}; // ok, refers to outer f
+float &f2 = with_float_2.f;
+
+// Within the lambda-expression's lambda-declarator (FIXME) and
+// compound-statement, the identifier in the init-capture hides any declaration
+// of the same name in scopes enclosing the lambda-expression.
+void hiding() {
+ char c;
+ (void) [c("foo")] {
+ static_assert(sizeof(c) == sizeof(const char*), "");
+ };
+ (void) [c("bar")] () -> decltype(c) {
+ // FIXME: the 'c' in the return type should be the init-capture, not the
+ // outer c.
+ return "baz"; // expected-error {{cannot initialize}}
+ };
+}
+
+struct ExplicitCopy {
+ ExplicitCopy(); // expected-note 2{{not viable}}
+ explicit ExplicitCopy(const ExplicitCopy&);
+};
+auto init_kind_1 = [ec(ExplicitCopy())] {};
+auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}}
+
+template<typename T> void init_kind_template() {
+ auto init_kind_1 = [ec(T())] {};
+ auto init_kind_2 = [ec = T()] {}; // expected-error {{no matching constructor}}
+}
+template void init_kind_template<int>();
+template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}}
+
+void void_fn();
+int overload_fn();
+int overload_fn(int);
+
+auto bad_init_1 = [a()] {}; // expected-error {{expected expression}}
+auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}}
+auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}}
+auto bad_init_4 = [a(void_fn())] {}; // expected-error {{field has incomplete type 'void'}}
+auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}}
+auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}}
+
+template<typename...T> void pack_1(T...t) { [a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}}
+template void pack_1<>(); // expected-note {{instantiation of}}
+
+auto multi_return(int a, int b) {
+ return [n(a + 2*b), m(a - 2*b)] {};
+}
+auto use_multi_return() {
+ auto nm = multi_return(5, 9);
+ return nm.n + nm.m;
+}
+
+auto a = [a(4), b = 5, &c = static_cast<const int&&>(0)] {
+ static_assert(sizeof(a) == sizeof(int), "");
+ static_assert(sizeof(b) == sizeof(int), "");
+ using T = decltype(c);
+ using T = const int &;
+};
+auto b = [a{0}] {}; // expected-error {{include <initializer_list>}}
+
+struct S { S(); S(S&&); };
+template<typename T> struct remove_reference { typedef T type; };
+template<typename T> struct remove_reference<T&> { typedef T type; };
+template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); }
+auto s = [s(move(S()))] {};
diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p23.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p23.cpp
index 82fc04a..174ae6d 100644
--- a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p23.cpp
+++ b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p23.cpp
@@ -1,4 +1,5 @@
// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
+// RUN: %clang_cc1 -fsyntax-only -std=c++1y %s -verify
void print();
@@ -56,3 +57,25 @@
}
template void variadic_lambda(int*, float*, double*);
+
+template<typename ...Args>
+void init_capture_pack_err(Args ...args) {
+ [as(args)...] {} (); // expected-error {{expected ','}}
+ [as...(args)]{} (); // expected-error {{expected ','}}
+}
+
+template<typename ...Args>
+void init_capture_pack_multi(Args ...args) {
+ [as(args...)] {} (); // expected-error {{initializer missing}} expected-error {{multiple}}
+}
+template void init_capture_pack_multi(); // expected-note {{instantiation}}
+template void init_capture_pack_multi(int);
+template void init_capture_pack_multi(int, int); // expected-note {{instantiation}}
+
+template<typename ...Args>
+void init_capture_pack_outer(Args ...args) {
+ print([as(args)] { return sizeof(as); } () ...);
+}
+template void init_capture_pack_outer();
+template void init_capture_pack_outer(int);
+template void init_capture_pack_outer(int, int);
diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p8.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p8.cpp
index d1384f1..408fb75 100644
--- a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p8.cpp
+++ b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p8.cpp
@@ -26,4 +26,7 @@
(void)[=, this]{ }; // expected-error{{'this' cannot be explicitly captured}}
(void)[=]{ this->g(i); };
(void)[i, i]{ }; // expected-error{{'i' can appear only once in a capture list}}
+ (void)[i(0), i(1)]{ }; // expected-error{{'i' can appear only once in a capture list}}
+ (void)[i, i(1)]{ }; // expected-error{{'i' can appear only once in a capture list}}
+ (void)[i(0), i]{ }; // expected-error{{'i' can appear only once in a capture list}}
}