| // RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment |
| |
| namespace StaticAssertFoldTest { |
| |
| int x; |
| static_assert(++x, "test"); // expected-error {{not an integral constant expression}} |
| static_assert(false, "test"); // expected-error {{test}} |
| |
| } |
| |
| template<typename T> constexpr T id(const T &t) { return t; } // expected-note {{here}} |
| // FIXME: support templates here. |
| //template<typename T> constexpr T min(const T &a, const T &b) { |
| // return a < b ? a : b; |
| //} |
| //template<typename T> constexpr T max(const T &a, const T &b) { |
| // return a < b ? b : a; |
| //} |
| constexpr int min(const int &a, const int &b) { return a < b ? a : b; } |
| constexpr int max(const int &a, const int &b) { return a < b ? b : a; } |
| |
| struct MemberZero { |
| constexpr int zero() { return 0; } |
| }; |
| |
| namespace DerivedToVBaseCast { |
| |
| struct U { int n; }; |
| struct V : U { int n; }; |
| struct A : virtual V { int n; }; |
| struct Aa { int n; }; |
| struct B : virtual A, Aa {}; |
| struct C : virtual A, Aa {}; |
| struct D : B, C {}; |
| |
| D d; |
| constexpr B *p = &d; |
| constexpr C *q = &d; |
| static_assert((void*)p != (void*)q, ""); |
| static_assert((A*)p == (A*)q, ""); |
| static_assert((Aa*)p != (Aa*)q, ""); |
| |
| constexpr B &pp = d; |
| constexpr C &qq = d; |
| static_assert((void*)&pp != (void*)&qq, ""); |
| static_assert(&(A&)pp == &(A&)qq, ""); |
| static_assert(&(Aa&)pp != &(Aa&)qq, ""); |
| |
| constexpr V *v = p; |
| constexpr V *w = q; |
| constexpr V *x = (A*)p; |
| static_assert(v == w, ""); |
| static_assert(v == x, ""); |
| |
| static_assert((U*)&d == p, ""); |
| static_assert((U*)&d == q, ""); |
| static_assert((U*)&d == v, ""); |
| static_assert((U*)&d == w, ""); |
| static_assert((U*)&d == x, ""); |
| |
| struct X {}; |
| struct Y1 : virtual X {}; |
| struct Y2 : X {}; |
| struct Z : Y1, Y2 {}; |
| Z z; |
| static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, ""); |
| |
| } |
| |
| namespace ConstCast { |
| |
| constexpr int n1 = 0; |
| constexpr int n2 = const_cast<int&>(n1); |
| constexpr int *n3 = const_cast<int*>(&n1); |
| constexpr int n4 = *const_cast<int*>(&n1); |
| constexpr const int * const *n5 = const_cast<const int* const*>(&n3); |
| constexpr int **n6 = const_cast<int**>(&n3); |
| constexpr int n7 = **n5; |
| constexpr int n8 = **n6; |
| |
| } |
| |
| namespace TemplateArgumentConversion { |
| template<int n> struct IntParam {}; |
| |
| using IntParam0 = IntParam<0>; |
| // FIXME: This should be accepted once we implement the new ICE rules. |
| using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}} |
| using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}} |
| } |
| |
| namespace CaseStatements { |
| void f(int n) { |
| switch (n) { |
| // FIXME: Produce the 'add ()' fixit for this. |
| case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}} expected-note {{non-literal type '<bound member function type>'}} |
| // FIXME: This should be accepted once we implement the new ICE rules. |
| case id(1): // expected-error {{not an integer constant expression}} expected-note {{undefined function}} |
| return; |
| } |
| } |
| } |
| |
| extern int &Recurse1; |
| int &Recurse2 = Recurse1; // expected-note 2{{declared here}} expected-note {{initializer of 'Recurse1' is not a constant expression}} |
| int &Recurse1 = Recurse2; // expected-note {{declared here}} expected-note {{initializer of 'Recurse2' is not a constant expression}} |
| constexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'Recurse2' is not a constant expression}} |
| |
| extern const int RecurseA; |
| const int RecurseB = RecurseA; // expected-note {{declared here}} |
| const int RecurseA = 10; |
| constexpr int RecurseC = RecurseB; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'RecurseB' is not a constant expression}} |
| |
| namespace MemberEnum { |
| struct WithMemberEnum { |
| enum E { A = 42 }; |
| } wme; |
| |
| static_assert(wme.A == 42, ""); |
| } |
| |
| namespace DefaultArguments { |
| |
| const int z = int(); |
| constexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { |
| return a + b + *c + d; |
| } |
| const int four = 4; |
| constexpr int eight = 8; |
| constexpr const int twentyseven = 27; |
| static_assert(Sum() == 0, ""); |
| static_assert(Sum(1) == 1, ""); |
| static_assert(Sum(1, four) == 5, ""); |
| static_assert(Sum(1, eight, &twentyseven) == 36, ""); |
| static_assert(Sum(1, 2, &four, eight) == 15, ""); |
| |
| } |
| |
| namespace Ellipsis { |
| |
| // Note, values passed through an ellipsis can't actually be used. |
| constexpr int F(int a, ...) { return a; } |
| static_assert(F(0) == 0, ""); |
| static_assert(F(1, 0) == 1, ""); |
| static_assert(F(2, "test") == 2, ""); |
| static_assert(F(3, &F) == 3, ""); |
| int k = 0; |
| static_assert(F(4, k) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| |
| } |
| |
| namespace Recursion { |
| constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } |
| static_assert(fib(11) == 89, ""); |
| |
| constexpr int gcd_inner(int a, int b) { |
| return b == 0 ? a : gcd_inner(b, a % b); |
| } |
| constexpr int gcd(int a, int b) { |
| return gcd_inner(max(a, b), min(a, b)); |
| } |
| |
| static_assert(gcd(1749237, 5628959) == 7, ""); |
| } |
| |
| namespace FunctionCast { |
| // When folding, we allow functions to be cast to different types. Such |
| // cast functions cannot be called, even if they're constexpr. |
| constexpr int f() { return 1; } |
| typedef double (*DoubleFn)(); |
| typedef int (*IntFn)(); |
| int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} expected-warning{{extension}} |
| int b[(int)IntFn(f)()]; // ok |
| } |
| |
| namespace StaticMemberFunction { |
| struct S { |
| static constexpr int k = 42; |
| static constexpr int f(int n) { return n * k + 2; } |
| } s; |
| |
| constexpr int n = s.f(19); |
| static_assert(S::f(19) == 800, ""); |
| static_assert(s.f(19) == 800, ""); |
| static_assert(n == 800, ""); |
| |
| constexpr int (*sf1)(int) = &S::f; |
| constexpr int (*sf2)(int) = &s.f; |
| constexpr const int *sk = &s.k; |
| } |
| |
| namespace ParameterScopes { |
| |
| const int k = 42; |
| constexpr const int &ObscureTheTruth(const int &a) { return a; } // expected-note 3{{reference to 'a' cannot be returned from a constexpr function}} |
| constexpr const int &MaybeReturnJunk(bool b, const int a) { // expected-note 2{{declared here}} |
| return ObscureTheTruth(b ? a : k); // expected-note 2{{in call to 'ObscureTheTruth(a)'}} |
| } |
| static_assert(MaybeReturnJunk(false, 0) == 42, ""); // ok |
| constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} expected-note {{in call to 'MaybeReturnJunk(1, 0)'}} |
| |
| constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { // expected-note {{here}} |
| // If ObscureTheTruth returns a reference to 'a', the result is not a |
| // constant expression even though 'a' is still in scope. |
| return ObscureTheTruth(b ? a : k); // expected-note {{in call to 'ObscureTheTruth(a)'}} |
| } |
| static_assert(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok |
| constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}} expected-note {{in call to 'MaybeReturnNonstaticRef(1, 0)'}} |
| |
| constexpr int InternalReturnJunk(int n) { |
| // FIXME: We should reject this: it never produces a constant expression. |
| return MaybeReturnJunk(true, n); // expected-note {{in call to 'MaybeReturnJunk(1, 0)'}} |
| } |
| constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'InternalReturnJunk(0)'}} |
| |
| constexpr int LToR(int &n) { return n; } |
| constexpr int GrabCallersArgument(bool which, int a, int b) { |
| return LToR(which ? b : a); |
| } |
| static_assert(GrabCallersArgument(false, 1, 2) == 1, ""); |
| static_assert(GrabCallersArgument(true, 4, 8) == 8, ""); |
| |
| } |
| |
| namespace Pointers { |
| |
| constexpr int f(int n, const int *a, const int *b, const int *c) { |
| return n == 0 ? 0 : *a + f(n-1, b, c, a); |
| } |
| |
| const int x = 1, y = 10, z = 100; |
| static_assert(f(23, &x, &y, &z) == 788, ""); |
| |
| constexpr int g(int n, int a, int b, int c) { |
| return f(n, &a, &b, &c); |
| } |
| static_assert(g(23, x, y, z) == 788, ""); |
| |
| } |
| |
| namespace FunctionPointers { |
| |
| constexpr int Double(int n) { return 2 * n; } |
| constexpr int Triple(int n) { return 3 * n; } |
| constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } |
| constexpr int Quadruple(int n) { return Twice(Double, n); } |
| constexpr auto Select(int n) -> int (*)(int) { |
| return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; |
| } |
| constexpr int Apply(int (*F)(int), int n) { return F(n); } // expected-note {{subexpression}} |
| |
| static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); |
| |
| constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'Apply(0, 0)'}} |
| |
| } |
| |
| namespace PointerComparison { |
| |
| int x, y; |
| static_assert(&x == &y, "false"); // expected-error {{false}} |
| static_assert(&x != &y, ""); |
| constexpr bool g1 = &x == &y; |
| constexpr bool g2 = &x != &y; |
| constexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} |
| |
| struct S { int x, y; } s; |
| static_assert(&s.x == &s.y, "false"); // expected-error {{false}} |
| static_assert(&s.x != &s.y, ""); |
| static_assert(&s.x <= &s.y, ""); |
| static_assert(&s.x >= &s.y, "false"); // expected-error {{false}} |
| static_assert(&s.x < &s.y, ""); |
| static_assert(&s.x > &s.y, "false"); // expected-error {{false}} |
| |
| static_assert(0 == &y, "false"); // expected-error {{false}} |
| static_assert(0 != &y, ""); |
| constexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} |
| |
| static_assert(&x == 0, "false"); // expected-error {{false}} |
| static_assert(&x != 0, ""); |
| constexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} |
| |
| static_assert(&x == &x, ""); |
| static_assert(&x != &x, "false"); // expected-error {{false}} |
| static_assert(&x <= &x, ""); |
| static_assert(&x >= &x, ""); |
| static_assert(&x < &x, "false"); // expected-error {{false}} |
| static_assert(&x > &x, "false"); // expected-error {{false}} |
| |
| constexpr S* sptr = &s; |
| constexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); // expected-error {{constant expression}} expected-note {{dynamic_cast}} |
| |
| struct Str { |
| // FIXME: In C++ mode, we should say 'integral' not 'integer' |
| int a : dynamic_cast<S*>(sptr) == dynamic_cast<S*>(sptr); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{dynamic_cast is not allowed in a constant expression}} |
| int b : reinterpret_cast<S*>(sptr) == reinterpret_cast<S*>(sptr); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{reinterpret_cast is not allowed in a constant expression}} |
| int c : (S*)(long)(sptr) == (S*)(long)(sptr); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} |
| int d : (S*)(42) == (S*)(42); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} |
| int e : (Str*)(sptr) == (Str*)(sptr); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} |
| int f : &(Str&)(*sptr) == &(Str&)(*sptr); // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} |
| int g : (S*)(void*)(sptr) == sptr; // \ |
| expected-warning {{not integer constant expression}} \ |
| expected-note {{cast from 'void *' is not allowed in a constant expression}} |
| }; |
| |
| extern char externalvar[]; |
| constexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} |
| constexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} |
| static_assert(0 != "foo", ""); |
| |
| } |
| |
| namespace MaterializeTemporary { |
| |
| constexpr int f(const int &r) { return r; } |
| constexpr int n = f(1); |
| |
| constexpr bool same(const int &a, const int &b) { return &a == &b; } |
| constexpr bool sameTemporary(const int &n) { return same(n, n); } |
| |
| static_assert(n, ""); |
| static_assert(!same(4, 4), ""); |
| static_assert(same(n, n), ""); |
| static_assert(sameTemporary(9), ""); |
| |
| } |
| |
| constexpr int strcmp_ce(const char *p, const char *q) { |
| return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); |
| } |
| |
| namespace StringLiteral { |
| |
| // FIXME: Refactor this once we support constexpr templates. |
| constexpr int MangleChars(const char *p) { |
| return *p + 3 * (*p ? MangleChars(p+1) : 0); |
| } |
| constexpr int MangleChars(const char16_t *p) { |
| return *p + 3 * (*p ? MangleChars(p+1) : 0); |
| } |
| constexpr int MangleChars(const char32_t *p) { |
| return *p + 3 * (*p ? MangleChars(p+1) : 0); |
| } |
| |
| static_assert(MangleChars("constexpr!") == 1768383, ""); |
| static_assert(MangleChars(u"constexpr!") == 1768383, ""); |
| static_assert(MangleChars(U"constexpr!") == 1768383, ""); |
| |
| constexpr char c0 = "nought index"[0]; |
| constexpr char c1 = "nice index"[10]; |
| constexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is past the end}} |
| constexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}} |
| constexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} |
| |
| constexpr const char *p = "test" + 2; |
| static_assert(*p == 's', ""); |
| |
| constexpr const char *max_iter(const char *a, const char *b) { |
| return *a < *b ? b : a; |
| } |
| constexpr const char *max_element(const char *a, const char *b) { |
| return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); |
| } |
| |
| constexpr const char *begin(const char (&arr)[45]) { return arr; } |
| constexpr const char *end(const char (&arr)[45]) { return arr + 45; } |
| |
| constexpr char str[] = "the quick brown fox jumped over the lazy dog"; |
| constexpr const char *max = max_element(begin(str), end(str)); |
| static_assert(*max == 'z', ""); |
| static_assert(max == str + 38, ""); |
| |
| static_assert(strcmp_ce("hello world", "hello world") == 0, ""); |
| static_assert(strcmp_ce("hello world", "hello clang") > 0, ""); |
| static_assert(strcmp_ce("constexpr", "test") < 0, ""); |
| static_assert(strcmp_ce("", " ") < 0, ""); |
| |
| } |
| |
| namespace Array { |
| |
| // FIXME: Use templates for these once we support constexpr templates. |
| constexpr int Sum(const int *begin, const int *end) { |
| return begin == end ? 0 : *begin + Sum(begin+1, end); |
| } |
| constexpr const int *begin(const int (&xs)[5]) { return xs; } |
| constexpr const int *end(const int (&xs)[5]) { return xs + 5; } |
| |
| constexpr int xs[] = { 1, 2, 3, 4, 5 }; |
| constexpr int ys[] = { 5, 4, 3, 2, 1 }; |
| constexpr int sum_xs = Sum(begin(xs), end(xs)); |
| static_assert(sum_xs == 15, ""); |
| |
| constexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, |
| const int *xs, const int *ys, int c) { |
| return n ? F( |
| *xs, // expected-note {{subexpression not valid}} |
| *ys, |
| ZipFoldR(F, n-1, xs+1, ys+1, c)) // \ |
| expected-note {{in call to 'ZipFoldR(&SubMul, 2, &xs[4], &ys[4], 1)'}} \ |
| expected-note {{in call to 'ZipFoldR(&SubMul, 1, &xs[5], &ys[5], 1)'}} |
| : c; |
| } |
| constexpr int MulAdd(int x, int y, int c) { return x * y + c; } |
| constexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); |
| static_assert(InnerProduct == 35, ""); |
| |
| constexpr int SubMul(int x, int y, int c) { return (x - y) * c; } |
| constexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); |
| static_assert(DiffProd == 8, ""); |
| static_assert(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // \ |
| expected-error {{constant expression}} \ |
| expected-note {{in call to 'ZipFoldR(&SubMul, 3, &xs[3], &ys[3], 1)'}} |
| |
| constexpr const int *p = xs + 3; |
| constexpr int xs4 = p[1]; // ok |
| constexpr int xs5 = p[2]; // expected-error {{constant expression}} |
| constexpr int xs0 = p[-3]; // ok |
| constexpr int xs_1 = p[-4]; // expected-error {{constant expression}} |
| |
| constexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; |
| static_assert(zs[0][0][0][0] == 1, ""); |
| static_assert(zs[1][1][1][1] == 16, ""); |
| static_assert(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert((&zs[0][0][0][2])[-1] == 2, ""); |
| static_assert(**(**(zs + 1) + 1) == 11, ""); |
| static_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); |
| |
| constexpr int fail(const int &p) { |
| return (&p)[64]; // expected-note {{subexpression}} |
| } |
| static_assert(fail(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1)) == 11, ""); // \ |
| expected-error {{static_assert expression is not an integral constant expression}} \ |
| expected-note {{in call to 'fail(zs[1][0][1][0])'}} |
| |
| constexpr int arr[40] = { 1, 2, 3, [8] = 4 }; // expected-warning {{extension}} |
| constexpr int SumNonzero(const int *p) { |
| return *p + (*p ? SumNonzero(p+1) : 0); |
| } |
| constexpr int CountZero(const int *p, const int *q) { |
| return p == q ? 0 : (*p == 0) + CountZero(p+1, q); |
| } |
| static_assert(SumNonzero(arr) == 6, ""); |
| static_assert(CountZero(arr, arr + 40) == 36, ""); |
| |
| struct ArrayElem { |
| constexpr ArrayElem() : n(0) {} |
| int n; |
| constexpr int f() { return n; } |
| }; |
| struct ArrayRVal { |
| constexpr ArrayRVal() {} |
| ArrayElem elems[10]; |
| }; |
| static_assert(ArrayRVal().elems[3].f() == 0, ""); |
| |
| } |
| |
| namespace DependentValues { |
| |
| struct I { int n; typedef I V[10]; }; |
| I::V x, y; |
| template<bool B> struct S { |
| int k; |
| void f() { |
| I::V &cells = B ? x : y; |
| I &i = cells[k]; |
| switch (i.n) {} |
| } |
| }; |
| |
| } |
| |
| namespace Class { |
| |
| struct A { constexpr A(int a, int b) : k(a + b) {} int k; }; |
| constexpr int fn(const A &a) { return a.k; } |
| static_assert(fn(A(4,5)) == 9, ""); |
| |
| struct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} |
| struct C { |
| constexpr C(C *this_) : m(42), n(this_->m) {} // ok |
| int m, n; |
| }; |
| struct D { |
| C c; |
| constexpr D() : c(&c) {} |
| }; |
| static_assert(D().c.n == 42, ""); |
| |
| struct E { // expected-note {{here}} |
| constexpr E() : p(&p) {} // expected-note {{pointer to temporary cannot be used to initialize a member in a constant expression}} |
| void *p; |
| }; |
| constexpr const E &e1 = E(); // expected-error {{constant expression}} expected-note {{in call to 'E()'}} expected-note {{temporary created here}} |
| // This is a constant expression if we elide the copy constructor call, and |
| // is not a constant expression if we don't! But we do, so it is. |
| // FIXME: The move constructor is not currently implicitly defined as constexpr. |
| constexpr E e2 = E(); // unexpected-error {{constant expression}} unexpected-note {{here}} unexpected-note {{non-constexpr constructor 'E' cannot be used in a constant expression}} |
| static_assert(e2.p == &e2.p, ""); // unexpected-error {{constant expression}} unexpected-note {{initializer of 'e2' is not a constant expression}} |
| constexpr E e3; |
| static_assert(e3.p == &e3.p, ""); |
| |
| extern const class F f; |
| struct F { |
| constexpr F() : p(&f.p) {} |
| const void *p; |
| }; |
| constexpr F f; |
| |
| struct G { |
| struct T { |
| constexpr T(T *p) : u1(), u2(p) {} |
| union U1 { |
| constexpr U1() {} |
| int a, b = 42; |
| } u1; |
| union U2 { |
| constexpr U2(T *p) : c(p->u1.b) {} |
| int c, d; |
| } u2; |
| } t; |
| constexpr G() : t(&t) {} |
| } constexpr g; |
| |
| static_assert(g.t.u1.a == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert(g.t.u1.b == 42, ""); |
| static_assert(g.t.u2.c == 42, ""); |
| static_assert(g.t.u2.d == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| |
| struct S { |
| int a, b; |
| const S *p; |
| double d; |
| const char *q; |
| |
| constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} |
| }; |
| |
| S global(43, &global); |
| |
| static_assert(S(15, &global).b == 15, ""); |
| |
| constexpr bool CheckS(const S &s) { |
| return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; |
| } |
| static_assert(CheckS(S(27, &global)), ""); |
| |
| struct Arr { |
| char arr[3]; |
| constexpr Arr() : arr{'x', 'y', 'z'} {} |
| }; |
| constexpr int hash(Arr &&a) { |
| return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; |
| } |
| constexpr int k = hash(Arr()); |
| static_assert(k == 0x007a7978, ""); |
| |
| |
| struct AggregateInit { |
| const char &c; |
| int n; |
| double d; |
| int arr[5]; |
| void *p; |
| }; |
| |
| constexpr AggregateInit agg1 = { "hello"[0] }; |
| |
| static_assert(strcmp_ce(&agg1.c, "hello") == 0, ""); |
| static_assert(agg1.n == 0, ""); |
| static_assert(agg1.d == 0.0, ""); |
| static_assert(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert(agg1.arr[0] == 0, ""); |
| static_assert(agg1.arr[4] == 0, ""); |
| static_assert(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert(agg1.p == nullptr, ""); |
| |
| namespace SimpleDerivedClass { |
| |
| struct B { |
| constexpr B(int n) : a(n) {} |
| int a; |
| }; |
| struct D : B { |
| constexpr D(int n) : B(n) {} |
| }; |
| constexpr D d(3); |
| static_assert(d.a == 3, ""); |
| |
| } |
| |
| struct Bottom { constexpr Bottom() {} }; |
| struct Base : Bottom { |
| constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} |
| int a; |
| const char *b; |
| }; |
| struct Base2 : Bottom { |
| constexpr Base2(const int &r) : r(r) {} |
| int q = 123; |
| const int &r; |
| }; |
| struct Derived : Base, Base2 { |
| constexpr Derived() : Base(76), Base2(a) {} |
| int c = r + b[1]; |
| }; |
| |
| constexpr bool operator==(const Base &a, const Base &b) { |
| return a.a == b.a && strcmp_ce(a.b, b.b) == 0; |
| } |
| |
| constexpr Base base; |
| constexpr Base base2(76); |
| constexpr Derived derived; |
| static_assert(derived.a == 76, ""); |
| static_assert(derived.b[2] == 's', ""); |
| static_assert(derived.c == 76 + 'e', ""); |
| static_assert(derived.q == 123, ""); |
| static_assert(derived.r == 76, ""); |
| static_assert(&derived.r == &derived.a, ""); |
| |
| static_assert(!(derived == base), ""); |
| static_assert(derived == base2, ""); |
| |
| constexpr Bottom &bot1 = (Base&)derived; |
| constexpr Bottom &bot2 = (Base2&)derived; |
| static_assert(&bot1 != &bot2, ""); |
| |
| constexpr Bottom *pb1 = (Base*)&derived; |
| constexpr Bottom *pb2 = (Base2*)&derived; |
| static_assert(pb1 != pb2, ""); |
| static_assert(pb1 == &bot1, ""); |
| static_assert(pb2 == &bot2, ""); |
| |
| constexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}} |
| constexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}} |
| constexpr Base2 &ok2 = (Base2&)bot2; |
| static_assert(&ok2 == &derived, ""); |
| |
| constexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}} |
| constexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}} |
| constexpr Base2 *pok2 = (Base2*)pb2; |
| static_assert(pok2 == &derived, ""); |
| static_assert(&ok2 == pok2, ""); |
| static_assert((Base2*)(Derived*)(Base*)pb1 == pok2, ""); |
| static_assert((Derived*)(Base*)pb1 == (Derived*)pok2, ""); |
| |
| constexpr Base *nullB = 42 - 6 * 7; |
| static_assert((Bottom*)nullB == 0, ""); |
| static_assert((Derived*)nullB == 0, ""); |
| static_assert((void*)(Bottom*)nullB == (void*)(Derived*)nullB, ""); |
| |
| } |
| |
| namespace Temporaries { |
| |
| struct S { |
| constexpr S() {} |
| constexpr int f(); |
| }; |
| struct T : S { |
| constexpr T(int n) : S(), n(n) {} |
| int n; |
| }; |
| constexpr int S::f() { |
| // 'this' must be the postfix-expression in a class member access expression, |
| // so we can't just use |
| // return static_cast<T*>(this)->n; |
| return this->*(int(S::*))&T::n; |
| } |
| // The T temporary is implicitly cast to an S subobject, but we can recover the |
| // T full-object via a base-to-derived cast, or a derived-to-base-casted member |
| // pointer. |
| static_assert(T(3).f() == 3, ""); |
| |
| constexpr int f(const S &s) { |
| return static_cast<const T&>(s).n; |
| } |
| constexpr int n = f(T(5)); |
| static_assert(f(T(5)) == 5, ""); |
| |
| } |
| |
| namespace Union { |
| |
| union U { |
| int a; |
| int b; |
| }; |
| |
| constexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; // expected-warning 4{{extension}} |
| static_assert(u[0].a == 0, ""); |
| static_assert(u[0].b, ""); // expected-error {{constant expression}} |
| static_assert(u[1].b == 1, ""); |
| static_assert((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} |
| static_assert((&(u[1]) + 1 + 1)->b == 3, ""); |
| |
| } |
| |
| namespace MemberPointer { |
| struct A { |
| constexpr A(int n) : n(n) {} |
| int n; |
| constexpr int f() { return n + 3; } |
| }; |
| constexpr A a(7); |
| static_assert(A(5).*&A::n == 5, ""); |
| static_assert((&a)->*&A::n == 7, ""); |
| static_assert((A(8).*&A::f)() == 11, ""); |
| static_assert(((&a)->*&A::f)() == 10, ""); |
| |
| struct B : A { |
| constexpr B(int n, int m) : A(n), m(m) {} |
| int m; |
| constexpr int g() { return n + m + 1; } |
| }; |
| constexpr B b(9, 13); |
| static_assert(B(4, 11).*&A::n == 4, ""); |
| static_assert(B(4, 11).*&B::m == 11, ""); |
| static_assert(B(4, 11).*(int(A::*))&B::m == 11, ""); |
| static_assert((&b)->*&A::n == 9, ""); |
| static_assert((&b)->*&B::m == 13, ""); |
| static_assert((&b)->*(int(A::*))&B::m == 13, ""); |
| static_assert((B(4, 11).*&A::f)() == 7, ""); |
| static_assert((B(4, 11).*&B::g)() == 16, ""); |
| static_assert((B(4, 11).*(int(A::*)()const)&B::g)() == 16, ""); |
| static_assert(((&b)->*&A::f)() == 12, ""); |
| static_assert(((&b)->*&B::g)() == 23, ""); |
| static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, ""); |
| |
| struct S { |
| constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) : |
| m(m), n(n), pf(pf), pn(pn) {} |
| constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {} |
| |
| constexpr int f() { return this->*pn; } |
| virtual int g() const; |
| |
| int m, n; |
| int (S::*pf)() const; |
| int S::*pn; |
| }; |
| |
| constexpr int S::*pm = &S::m; |
| constexpr int S::*pn = &S::n; |
| constexpr int (S::*pf)() const = &S::f; |
| constexpr int (S::*pg)() const = &S::g; |
| |
| constexpr S s(2, 5, &S::f, &S::m); |
| |
| static_assert((s.*&S::f)() == 2, ""); |
| static_assert((s.*s.pf)() == 2, ""); |
| |
| template<int n> struct T : T<n-1> {}; |
| template<> struct T<0> { int n; }; |
| template<> struct T<30> : T<29> { int m; }; |
| |
| T<17> t17; |
| T<30> t30; |
| |
| constexpr int (T<10>::*deepn) = &T<0>::n; |
| static_assert(&(t17.*deepn) == &t17.n, ""); |
| |
| constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m; |
| constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}} |
| static_assert(&(t30.*deepm) == &t30.m, ""); |
| |
| constexpr T<5> *p17_5 = &t17; |
| constexpr T<13> *p17_13 = (T<13>*)p17_5; |
| constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}} |
| static_assert(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, ""); |
| static_assert(&(p17_13->*deepn) == &t17.n, ""); |
| constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}} |
| |
| constexpr T<5> *p30_5 = &t30; |
| constexpr T<23> *p30_23 = (T<23>*)p30_5; |
| constexpr T<13> *p30_13 = p30_23; |
| static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, ""); |
| static_assert(&(p30_13->*deepn) == &t30.n, ""); |
| static_assert(&(p30_23->*deepn) == &t30.n, ""); |
| static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, ""); |
| static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, ""); |
| static_assert(&(p30_23->*deepm) == &t30.m, ""); |
| } |
| |
| namespace ArrayBaseDerived { |
| |
| struct Base { |
| constexpr Base() {} |
| int n = 0; |
| }; |
| struct Derived : Base { |
| constexpr Derived() {} |
| constexpr const int *f() { return &n; } |
| }; |
| |
| constexpr Derived a[10]; |
| constexpr Derived *pd3 = const_cast<Derived*>(&a[3]); |
| constexpr Base *pb3 = const_cast<Derived*>(&a[3]); |
| static_assert(pb3 == pd3, ""); |
| |
| // pb3 does not point to an array element. |
| constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer. |
| constexpr int pb4n = pb4->n; // expected-error {{constant expression}} |
| constexpr Base *err_pb5 = pb3 + 2; // FIXME: reject this. |
| constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}} |
| constexpr Base *err_pb2 = pb3 - 1; // FIXME: reject this. |
| constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}} |
| constexpr Base *pb3a = pb4 - 1; |
| |
| // pb4 does not point to a Derived. |
| constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}} |
| constexpr Derived *pd3a = (Derived*)pb3a; |
| constexpr int pd3n = pd3a->n; |
| |
| // pd3a still points to the Derived array. |
| constexpr Derived *pd6 = pd3a + 3; |
| static_assert(pd6 == &a[6], ""); |
| constexpr Derived *pd9 = pd6 + 3; |
| constexpr Derived *pd10 = pd6 + 4; |
| constexpr int pd9n = pd9->n; // ok |
| constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}} |
| constexpr int pd0n = pd10[-10].n; |
| constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}} |
| |
| constexpr Base *pb9 = pd9; |
| constexpr const int *(Base::*pfb)() const = |
| static_cast<const int *(Base::*)() const>(&Derived::f); |
| static_assert((pb9->*pfb)() == &a[9].n, ""); |
| } |
| |
| namespace Complex { |
| |
| class complex { |
| int re, im; |
| public: |
| constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} |
| constexpr complex(const complex &o) : re(o.re), im(o.im) {} |
| constexpr complex operator-() const { return complex(-re, -im); } |
| friend constexpr complex operator+(const complex &l, const complex &r) { |
| return complex(l.re + r.re, l.im + r.im); |
| } |
| friend constexpr complex operator-(const complex &l, const complex &r) { |
| return l + -r; |
| } |
| friend constexpr complex operator*(const complex &l, const complex &r) { |
| return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); |
| } |
| friend constexpr bool operator==(const complex &l, const complex &r) { |
| return l.re == r.re && l.im == r.im; |
| } |
| constexpr bool operator!=(const complex &r) const { |
| return re != r.re || im != r.im; |
| } |
| constexpr int real() const { return re; } |
| constexpr int imag() const { return im; } |
| }; |
| |
| constexpr complex i = complex(0, 1); |
| constexpr complex k = (3 + 4*i) * (6 - 4*i); |
| static_assert(complex(1,0).real() == 1, ""); |
| static_assert(complex(1,0).imag() == 0, ""); |
| static_assert(((complex)1).imag() == 0, ""); |
| static_assert(k.real() == 34, ""); |
| static_assert(k.imag() == 12, ""); |
| static_assert(k - 34 == 12*i, ""); |
| static_assert((complex)1 == complex(1), ""); |
| static_assert((complex)1 != complex(0, 1), ""); |
| static_assert(complex(1) == complex(1), ""); |
| static_assert(complex(1) != complex(0, 1), ""); |
| constexpr complex makeComplex(int re, int im) { return complex(re, im); } |
| static_assert(makeComplex(1,0) == complex(1), ""); |
| static_assert(makeComplex(1,0) != complex(0, 1), ""); |
| |
| class complex_wrap : public complex { |
| public: |
| constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} |
| constexpr complex_wrap(const complex_wrap &o) : complex(o) {} |
| }; |
| |
| static_assert((complex_wrap)1 == complex(1), ""); |
| static_assert((complex)1 != complex_wrap(0, 1), ""); |
| static_assert(complex(1) == complex_wrap(1), ""); |
| static_assert(complex_wrap(1) != complex(0, 1), ""); |
| constexpr complex_wrap makeComplexWrap(int re, int im) { |
| return complex_wrap(re, im); |
| } |
| static_assert(makeComplexWrap(1,0) == complex(1), ""); |
| static_assert(makeComplexWrap(1,0) != complex(0, 1), ""); |
| |
| } |
| |
| namespace PR11595 { |
| struct A { constexpr bool operator==(int x) { return true; } }; |
| struct B { B(); ~B(); A& x; }; |
| static_assert(B().x == 3, ""); // expected-error {{constant expression}} |
| } |