144 lines
4.3 KiB
C++
144 lines
4.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 -pedantic %s
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// C++ [expr.const]p1:
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// In several places, C++ requires expressions that evaluate to an integral
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// or enumeration constant: as array bounds, as case expressions, as
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// bit-field lengths, as enumerator initializers, as static member
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// initializers, and as integral or enumeration non-type template arguments.
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// An integral constant-expression can involve only literals, enumerators,
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// const variables or static data members of integral or enumeration types
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// initialized with constant expressions, and sizeof expressions. Floating
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// literals can appear only if they are cast to integral or enumeration types.
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enum Enum { eval = 1 };
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const int cval = 2;
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const Enum ceval = eval;
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struct Struct {
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static const int sval = 3;
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static const Enum seval = eval;
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};
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template <int itval, Enum etval> struct C {
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enum E {
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v1 = 1,
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v2 = eval,
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v3 = cval,
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v4 = ceval,
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v5 = Struct::sval,
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v6 = Struct::seval,
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v7 = itval,
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v8 = etval,
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v9 = (int)1.5,
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v10 = sizeof(Struct),
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v11 = true? 1 + cval * Struct::sval ^ itval / (int)1.5 - sizeof(Struct) : 0
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};
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unsigned
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b1 : 1,
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b2 : eval,
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b3 : cval,
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b4 : ceval,
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b5 : Struct::sval,
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b6 : Struct::seval,
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b7 : itval,
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b8 : etval,
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b9 : (int)1.5,
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b10 : sizeof(Struct),
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b11 : true? 1 + cval * Struct::sval ^ itval / (int)1.5 - sizeof(Struct) : 0
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;
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static const int
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i1 = 1,
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i2 = eval,
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i3 = cval,
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i4 = ceval,
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i5 = Struct::sval,
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i6 = Struct::seval,
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i7 = itval,
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i8 = etval,
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i9 = (int)1.5,
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i10 = sizeof(Struct),
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i11 = true? 1 + cval * Struct::sval ^ itval / (int)1.5 - sizeof(Struct) : 0
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;
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void f(int cond) {
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switch(cond) {
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case 0 + 1:
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case 100 + eval:
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case 200 + cval:
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case 300 + ceval:
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case 400 + Struct::sval:
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case 500 + Struct::seval:
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case 600 + itval:
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case 700 + etval:
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case 800 + (int)1.5:
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case 900 + sizeof(Struct):
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case 1000 + (true? 1 + cval * Struct::sval ^
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itval / (int)1.5 - sizeof(Struct) : 0):
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;
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}
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}
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typedef C<itval, etval> T0;
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};
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template struct C<1, eval>;
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template struct C<cval, ceval>;
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template struct C<Struct::sval, Struct::seval>;
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enum {
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a = sizeof(int) == 8,
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b = a? 8 : 4
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};
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void diags(int n) {
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switch (n) {
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case (1/0, 1): // expected-error {{not an integral constant expression}} expected-note {{division by zero}}
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case (int)(1/0, 2.0): // expected-error {{not an integral constant expression}} expected-note {{division by zero}}
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case __imag(1/0): // expected-error {{not an integral constant expression}} expected-note {{division by zero}}
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case (int)__imag((double)(1/0)): // expected-error {{not an integral constant expression}} expected-note {{division by zero}}
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;
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}
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}
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namespace IntOrEnum {
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const int k = 0;
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const int &p = k;
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template<int n> struct S {};
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S<p> s; // expected-error {{not an integral constant expression}}
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}
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extern const int recurse1;
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// recurse2 cannot be used in a constant expression because it is not
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// initialized by a constant expression. The same expression appearing later in
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// the TU would be a constant expression, but here it is not.
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const int recurse2 = recurse1;
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const int recurse1 = 1;
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int array1[recurse1]; // ok
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int array2[recurse2]; // expected-warning {{variable length array}} expected-warning {{integer constant expression}}
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namespace FloatConvert {
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typedef int a[(int)42.3];
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typedef int a[(int)42.997];
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typedef int b[(long long)4e20]; // expected-warning {{variable length}} expected-error {{variable length}} expected-warning {{'long long' is a C++11 extension}}
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}
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// PR12626
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namespace test3 {
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struct X; // expected-note {{forward declaration of 'test3::X'}}
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struct Y { bool b; X x; }; // expected-error {{field has incomplete type 'test3::X'}}
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int f() { return Y().b; }
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}
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// PR18283
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namespace test4 {
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template <int> struct A {};
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int const i = { 42 };
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// i can be used as non-type template-parameter as "const int x = { 42 };" is
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// equivalent to "const int x = 42;" as per C++03 8.5/p13.
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typedef A<i> Ai; // ok
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}
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// rdar://16064952
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namespace rdar16064952 {
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template < typename T > void fn1() {
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T b;
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unsigned w = ({int a = b.val[sizeof(0)]; 0; }); // expected-warning {{use of GNU statement expression extension}}
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}
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}
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