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+// RUN: %clang_cc1 -std=c++0x -Wno-unused-value -fsyntax-only -verify -fblocks %s
+
+namespace std { class type_info; };
+
+namespace ExplicitCapture {
+ class C {
+ int Member;
+
+ static void Overload(int);
+ void Overload();
+ virtual C& Overload(float);
+
+ void ImplicitThisCapture() {
+ [](){(void)Member;}; // expected-error {{'this' cannot be implicitly captured in this context}}
+ [&](){(void)Member;};
+
+ [this](){(void)Member;};
+ [this]{[this]{};};
+ []{[this]{};};// expected-error {{'this' cannot be implicitly captured in this context}}
+ []{Overload(3);};
+ []{Overload();}; // expected-error {{'this' cannot be implicitly captured in this context}}
+ []{(void)typeid(Overload());};
+ []{(void)typeid(Overload(.5f));};// expected-error {{'this' cannot be implicitly captured in this context}}
+ }
+ };
+
+ void f() {
+ [this] () {}; // expected-error {{'this' cannot be captured in this context}}
+ }
+}
+
+namespace ReturnDeduction {
+ void test() {
+ [](){ return 1; };
+ [](){ return 1; };
+ [](){ return ({return 1; 1;}); };
+ [](){ return ({return 'c'; 1;}); }; // expected-error {{must match previous return type}} \
+ // expected-warning{{omitted result type}}
+ []()->int{ return 'c'; return 1; };
+ [](){ return 'c'; return 1; }; // expected-error {{must match previous return type}}
+ []() { return; return (void)0; };
+ [](){ return 1; return 1; }; // expected-warning{{omitted result type}}
+ }
+}
+
+namespace ImplicitCapture {
+ void test() {
+ int a = 0; // expected-note 5 {{declared}}
+ []() { return a; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{begins here}}
+ [&]() { return a; };
+ [=]() { return a; };
+ [=]() { int* b = &a; }; // expected-error {{cannot initialize a variable of type 'int *' with an rvalue of type 'const int *'}}
+ [=]() { return [&]() { return a; }; };
+ []() { return [&]() { return a; }; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
+ []() { return ^{ return a; }; };// expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
+ []() { return [&a] { return a; }; }; // expected-error 2 {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note 2 {{lambda expression begins here}}
+ [=]() { return [&a] { return a; }; }; //
+
+ const int b = 2;
+ []() { return b; };
+
+ union { // expected-note {{declared}}
+ int c;
+ float d;
+ };
+ d = 3;
+ [=]() { return c; }; // expected-error {{unnamed variable cannot be implicitly captured in a lambda expression}}
+
+ __block int e; // expected-note 3 {{declared}}
+ [&]() { return e; }; // expected-error {{__block variable 'e' cannot be captured in a lambda expression}}
+ [&e]() { return e; }; // expected-error 2 {{__block variable 'e' cannot be captured in a lambda expression}}
+
+ int f[10]; // expected-note {{declared}}
+ [&]() { return f[2]; };
+ (void) ^{ return []() { return f[2]; }; }; // expected-error {{variable 'f' cannot be implicitly captured in a lambda with no capture-default specified}} \
+ // expected-note{{lambda expression begins here}}
+
+ struct G { G(); G(G&); int a; }; // expected-note 6 {{not viable}}
+ G g;
+ [=]() { const G* gg = &g; return gg->a; }; // expected-warning{{omitted result type}}
+ [=]() { return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error {{no matching constructor for initialization of 'ImplicitCapture::G'}} \
+ // expected-warning{{omitted result type}}
+ (void)^{ return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error 2 {{no matching constructor for initialization of 'const ImplicitCapture::G'}} \
+ // expected-warning{{omitted result type}}
+
+ const int h = a; // expected-note {{declared}}
+ []() { return h; }; // expected-error {{variable 'h' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
+
+ // The exemption for variables which can appear in constant expressions
+ // applies only to objects (and not to references).
+ // FIXME: This might be a bug in the standard.
+ static int i;
+ constexpr int &ref_i = i; // expected-note {{declared}}
+ [] { return ref_i; }; // expected-error {{variable 'ref_i' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
+ }
+}
+
+namespace PR12031 {
+ struct X {
+ template<typename T>
+ X(const T&);
+ ~X();
+ };
+
+ void f(int i, X x);
+ void g() {
+ const int v = 10;
+ f(v, [](){});
+ }
+}
+
+namespace NullPtr {
+ int &f(int *p);
+ char &f(...);
+ void g() {
+ int n = 0;
+ [=] {
+ char &k = f(n); // not a null pointer constant
+ } ();
+
+ const int m = 0;
+ [=] {
+ int &k = f(m); // a null pointer constant
+ } ();
+
+ [=] () -> bool {
+ int &k = f(m); // a null pointer constant
+ return &m == 0;
+ } ();
+
+ [m] {
+ int &k = f(m); // a null pointer constant
+ } ();
+ }
+}
+
+void PR12248()
+{
+ unsigned int result = 0;
+ auto l = [&]() { ++result; };
+}
+
+namespace ModifyingCapture {
+ void test() {
+ int n = 0;
+ [=] {
+ n = 1; // expected-error {{cannot assign to a variable captured by copy in a non-mutable lambda}}
+ };
+ }
+}