479 lines
14 KiB
C++
479 lines
14 KiB
C++
// RUN: %clang_cc1 -std=c++11 -Wno-unused-value -fsyntax-only -verify -fblocks %s
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// RUN: %clang_cc1 -std=c++1y -Wno-unused-value -fsyntax-only -verify -fblocks %s
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namespace std { class type_info; };
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namespace ExplicitCapture {
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class C {
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int Member;
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static void Overload(int);
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void Overload();
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virtual C& Overload(float);
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void ImplicitThisCapture() {
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[](){(void)Member;}; // expected-error {{'this' cannot be implicitly captured in this context}}
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[&](){(void)Member;};
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[this](){(void)Member;};
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[this]{[this]{};};
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[]{[this]{};};// expected-error {{'this' cannot be implicitly captured in this context}}
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[]{Overload(3);};
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[]{Overload();}; // expected-error {{'this' cannot be implicitly captured in this context}}
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[]{(void)typeid(Overload());};
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[]{(void)typeid(Overload(.5f));};// expected-error {{'this' cannot be implicitly captured in this context}}
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}
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};
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void f() {
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[this] () {}; // expected-error {{'this' cannot be captured in this context}}
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}
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}
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namespace ReturnDeduction {
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void test() {
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[](){ return 1; };
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[](){ return 1; };
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[](){ return ({return 1; 1;}); };
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[](){ return ({return 'c'; 1;}); }; // expected-error {{must match previous return type}}
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[]()->int{ return 'c'; return 1; };
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[](){ return 'c'; return 1; }; // expected-error {{must match previous return type}}
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[]() { return; return (void)0; };
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[](){ return 1; return 1; };
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}
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}
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namespace ImplicitCapture {
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void test() {
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int a = 0; // expected-note 5 {{declared}}
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[]() { return a; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{begins here}}
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[&]() { return a; };
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[=]() { return a; };
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[=]() { int* b = &a; }; // expected-error {{cannot initialize a variable of type 'int *' with an rvalue of type 'const int *'}}
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[=]() { return [&]() { return a; }; };
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[]() { 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}}
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[]() { 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}}
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[]() { 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}}
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[=]() { return [&a] { return a; }; }; //
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const int b = 2;
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[]() { return b; };
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union { // expected-note {{declared}}
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int c;
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float d;
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};
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d = 3;
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[=]() { return c; }; // expected-error {{unnamed variable cannot be implicitly captured in a lambda expression}}
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__block int e; // expected-note 3 {{declared}}
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[&]() { return e; }; // expected-error {{__block variable 'e' cannot be captured in a lambda expression}}
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[&e]() { return e; }; // expected-error 2 {{__block variable 'e' cannot be captured in a lambda expression}}
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int f[10]; // expected-note {{declared}}
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[&]() { return f[2]; };
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(void) ^{ return []() { return f[2]; }; }; // expected-error {{variable 'f' cannot be implicitly captured in a lambda with no capture-default specified}} \
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// expected-note{{lambda expression begins here}}
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struct G { G(); G(G&); int a; }; // expected-note 6 {{not viable}}
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G g;
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[=]() { const G* gg = &g; return gg->a; };
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[=]() { return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error {{no matching constructor for initialization of 'G'}}
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(void)^{ return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error 2 {{no matching constructor for initialization of 'const G'}}
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const int h = a; // expected-note {{declared}}
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[]() { return h; }; // expected-error {{variable 'h' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
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// References can appear in constant expressions if they are initialized by
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// reference constant expressions.
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int i;
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int &ref_i = i; // expected-note {{declared}}
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[] { 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}}
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static int j;
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int &ref_j = j;
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[] { return ref_j; }; // ok
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}
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}
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namespace PR12031 {
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struct X {
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template<typename T>
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X(const T&);
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~X();
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};
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void f(int i, X x);
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void g() {
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const int v = 10;
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f(v, [](){});
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}
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}
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namespace Array {
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int &f(int *p);
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char &f(...);
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void g() {
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int n = -1;
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[=] {
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int arr[n]; // VLA
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} ();
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const int m = -1;
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[] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[&] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[=] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[m] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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}
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}
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void PR12248()
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{
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unsigned int result = 0;
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auto l = [&]() { ++result; };
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}
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namespace ModifyingCapture {
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void test() {
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int n = 0;
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[=] {
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n = 1; // expected-error {{cannot assign to a variable captured by copy in a non-mutable lambda}}
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};
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}
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}
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namespace VariadicPackExpansion {
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template<typename T, typename U> using Fst = T;
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template<typename...Ts> bool g(Fst<bool, Ts> ...bools);
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template<typename...Ts> bool f(Ts &&...ts) {
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return g<Ts...>([&ts] {
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if (!ts)
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return false;
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--ts;
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return true;
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} () ...);
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}
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void h() {
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int a = 5, b = 2, c = 3;
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while (f(a, b, c)) {
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}
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}
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struct sink {
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template<typename...Ts> sink(Ts &&...) {}
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};
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template<typename...Ts> void local_class() {
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sink {
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[] (Ts t) {
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struct S : Ts {
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void f(Ts t) {
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Ts &that = *this;
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that = t;
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}
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Ts g() { return *this; };
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};
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S s;
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s.f(t);
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return s;
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} (Ts()).g() ...
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};
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};
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struct X {}; struct Y {};
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template void local_class<X, Y>();
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template<typename...Ts> void nested(Ts ...ts) {
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f(
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// Each expansion of this lambda implicitly captures all of 'ts', because
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// the inner lambda also expands 'ts'.
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[&] {
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return ts + [&] { return f(ts...); } ();
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} () ...
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);
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}
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template void nested(int, int, int);
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template<typename...Ts> void nested2(Ts ...ts) { // expected-note 2{{here}}
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// Capture all 'ts', use only one.
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f([&ts...] { return ts; } ()...);
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// Capture each 'ts', use it.
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f([&ts] { return ts; } ()...);
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// Capture all 'ts', use all of them.
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f([&ts...] { return (int)f(ts...); } ());
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// Capture each 'ts', use all of them. Ill-formed. In more detail:
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//
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// We instantiate two lambdas here; the first captures ts$0, the second
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// captures ts$1. Both of them reference both ts parameters, so both are
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// ill-formed because ts can't be implicitly captured.
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//
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// FIXME: This diagnostic does not explain what's happening. We should
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// specify which 'ts' we're referring to in its diagnostic name. We should
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// also say which slice of the pack expansion is being performed in the
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// instantiation backtrace.
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f([&ts] { return (int)f(ts...); } ()...); // \
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// expected-error 2{{'ts' cannot be implicitly captured}} \
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// expected-note 2{{lambda expression begins here}}
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}
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template void nested2(int); // ok
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template void nested2(int, int); // expected-note {{in instantiation of}}
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}
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namespace PR13860 {
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void foo() {
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auto x = PR13860UndeclaredIdentifier(); // expected-error {{use of undeclared identifier 'PR13860UndeclaredIdentifier'}}
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auto y = [x]() { };
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static_assert(sizeof(y), "");
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}
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}
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namespace PR13854 {
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auto l = [](void){};
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}
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namespace PR14518 {
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auto f = [](void) { return __func__; }; // no-warning
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}
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namespace PR16708 {
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auto L = []() {
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auto ret = 0;
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return ret;
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return 0;
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};
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}
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namespace TypeDeduction {
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struct S {};
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void f() {
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const S s {};
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S &&t = [&] { return s; } ();
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#if __cplusplus > 201103L
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S &&u = [&] () -> auto { return s; } ();
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#endif
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}
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}
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namespace lambdas_in_NSDMIs {
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template<class T>
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struct L {
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T t{};
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T t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
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};
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L<int> l;
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namespace non_template {
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struct L {
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int t = 0;
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int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
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};
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L l;
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}
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}
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// PR18477: don't try to capture 'this' from an NSDMI encountered while parsing
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// a lambda.
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namespace NSDMIs_in_lambdas {
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template<typename T> struct S { int a = 0; int b = a; };
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void f() { []() { S<int> s; }; }
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auto x = []{ struct S { int n, m = n; }; };
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auto y = [&]{ struct S { int n, m = n; }; }; // expected-error {{non-local lambda expression cannot have a capture-default}}
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void g() { auto z = [&]{ struct S { int n, m = n; }; }; }
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}
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namespace CaptureIncomplete {
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struct Incomplete; // expected-note 2{{forward decl}}
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void g(const Incomplete &a);
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void f(Incomplete &a) {
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(void) [a] {}; // expected-error {{incomplete}}
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(void) [&a] {};
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(void) [=] { g(a); }; // expected-error {{incomplete}}
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(void) [&] { f(a); };
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}
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}
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namespace CaptureAbstract {
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struct S {
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virtual void f() = 0; // expected-note {{unimplemented}}
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int n = 0;
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};
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struct T : S {
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constexpr T() {}
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void f();
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};
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void f() {
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constexpr T t = T();
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S &s = const_cast<T&>(t);
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// FIXME: Once we properly compute odr-use per DR712, this should be
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// accepted (and should not capture 's').
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[=] { return s.n; }; // expected-error {{abstract}}
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}
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}
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namespace PR18128 {
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auto l = [=]{}; // expected-error {{non-local lambda expression cannot have a capture-default}}
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struct S {
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int n;
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int (*f())[true ? 1 : ([=]{ return n; }(), 0)];
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// expected-error@-1 {{non-local lambda expression cannot have a capture-default}}
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// expected-error@-2 {{invalid use of non-static data member 'n'}}
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// expected-error@-3 {{a lambda expression may not appear inside of a constant expression}}
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int g(int k = ([=]{ return n; }(), 0));
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// expected-error@-1 {{non-local lambda expression cannot have a capture-default}}
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// expected-error@-2 {{invalid use of non-static data member 'n'}}
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int a = [=]{ return n; }(); // ok
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int b = [=]{ return [=]{ return n; }(); }(); // ok
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int c = []{ int k = 0; return [=]{ return k; }(); }(); // ok
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int d = []{ return [=]{ return n; }(); }(); // expected-error {{'this' cannot be implicitly captured in this context}}
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};
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}
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namespace PR18473 {
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template<typename T> void f() {
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T t(0);
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(void) [=]{ int n = t; }; // expected-error {{deleted}}
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}
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template void f<int>();
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struct NoCopy {
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NoCopy(int);
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NoCopy(const NoCopy &) = delete; // expected-note {{deleted}}
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operator int() const;
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};
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template void f<NoCopy>(); // expected-note {{instantiation}}
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}
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void PR19249() {
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auto x = [&x]{}; // expected-error {{cannot appear in its own init}}
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}
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namespace PR20731 {
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template <class L, int X = sizeof(L)>
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void Job(L l);
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template <typename... Args>
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void Logger(Args &&... args) {
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auto len = Invalid_Function((args)...);
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// expected-error@-1 {{use of undeclared identifier 'Invalid_Function'}}
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Job([len]() {});
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}
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void GetMethod() {
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Logger();
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// expected-note@-1 {{in instantiation of function template specialization 'PR20731::Logger<>' requested here}}
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}
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template <typename T>
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struct A {
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T t;
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// expected-error@-1 {{field has incomplete type 'void'}}
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};
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template <typename F>
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void g(F f) {
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auto a = A<decltype(f())>{};
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// expected-note@-1 {{in instantiation of template class 'PR20731::A<void>' requested here}}
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auto xf = [a, f]() {};
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int x = sizeof(xf);
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};
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void f() {
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g([] {});
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// expected-note-re@-1 {{in instantiation of function template specialization 'PR20731::g<(lambda at {{.*}}>' requested here}}
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}
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template <class _Rp> struct function {
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template <class _Fp>
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function(_Fp) {
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static_assert(sizeof(_Fp) > 0, "Type must be complete.");
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}
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};
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template <typename T> void p(T t) {
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auto l = some_undefined_function(t);
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// expected-error@-1 {{use of undeclared identifier 'some_undefined_function'}}
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function<void()>(([l]() {}));
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}
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void q() { p(0); }
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// expected-note@-1 {{in instantiation of function template specialization 'PR20731::p<int>' requested here}}
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}
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namespace lambda_in_default_mem_init {
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template<typename T> void f() {
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struct S { int n = []{ return 0; }(); };
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}
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template void f<int>();
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template<typename T> void g() {
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struct S { int n = [](int n){ return n; }(0); };
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}
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template void g<int>();
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}
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namespace error_in_transform_prototype {
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template<class T>
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void f(T t) {
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// expected-error@+2 {{type 'int' cannot be used prior to '::' because it has no members}}
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// expected-error@+1 {{no member named 'ns' in 'error_in_transform_prototype::S'}}
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auto x = [](typename T::ns::type &k) {};
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}
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class S {};
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void foo() {
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f(5); // expected-note {{requested here}}
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f(S()); // expected-note {{requested here}}
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}
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}
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namespace PR21857 {
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template<typename Fn> struct fun : Fn {
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fun() = default;
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using Fn::operator();
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};
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template<typename Fn> fun<Fn> wrap(Fn fn);
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auto x = wrap([](){});
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}
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namespace PR13987 {
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class Enclosing {
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void Method(char c = []()->char {
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int d = []()->int {
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struct LocalClass {
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int Method() { return 0; }
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};
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return 0;
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}();
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return d; }()
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);
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};
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}
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namespace PR23860 {
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template <class> struct A {
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void f(int x = []() {
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struct B {
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void g() {}
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};
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return 0;
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}());
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};
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int main() {
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}
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A<int> a;
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}
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