134 lines
5.8 KiB
C++
134 lines
5.8 KiB
C++
// RUN: %clang_cc1 -std=c++11 -verify %s
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//
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// Note: [class.inhctor] was removed by P0136R1. This tests the new behavior
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// for the wording that used to be there.
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template<int> struct X {};
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// Constructor characteristics are:
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// - the template parameter list
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// - the parameter-type-list
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// - absence or presence of explicit
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// - absence or presence of constexpr
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struct A {
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A(X<0>) {} // expected-note 4{{here}}
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constexpr A(X<1>) {}
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explicit A(X<2>) {} // expected-note 6{{here}}
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explicit constexpr A(X<3>) {} // expected-note 4{{here}}
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};
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A a0 { X<0>{} };
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A a0i = { X<0>{} };
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constexpr A a0c { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr A a0ic = { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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A a1 { X<1>{} };
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A a1i = { X<1>{} };
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constexpr A a1c { X<1>{} };
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constexpr A a1ic = { X<1>{} };
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A a2 { X<2>{} };
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A a2i = { X<2>{} }; // expected-error {{constructor is explicit}}
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constexpr A a2c { X<2>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr A a2ic = { X<2>{} }; // expected-error {{constructor is explicit}}
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A a3 { X<3>{} };
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A a3i = { X<3>{} }; // expected-error {{constructor is explicit}}
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constexpr A a3c { X<3>{} };
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constexpr A a3ic = { X<3>{} }; // expected-error {{constructor is explicit}}
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struct B : A {
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using A::A;
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};
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B b0 { X<0>{} };
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B b0i = { X<0>{} };
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constexpr B b0c { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr B b0ic = { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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B b1 { X<1>{} };
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B b1i = { X<1>{} };
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constexpr B b1c { X<1>{} };
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constexpr B b1ic = { X<1>{} };
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B b2 { X<2>{} };
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B b2i = { X<2>{} }; // expected-error {{constructor is explicit}}
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constexpr B b2c { X<2>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr B b2ic = { X<2>{} }; // expected-error {{constructor is explicit}}
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B b3 { X<3>{} };
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B b3i = { X<3>{} }; // expected-error {{constructor is explicit}}
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constexpr B b3c { X<3>{} };
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constexpr B b3ic = { X<3>{} }; // expected-error {{constructor is explicit}}
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// 'constexpr' is OK even if the constructor doesn't obey the constraints.
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struct NonLiteral { NonLiteral(); };
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struct NonConstexpr { NonConstexpr(); constexpr NonConstexpr(int); };
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struct Constexpr { constexpr Constexpr(int) {} };
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struct BothNonLiteral : NonLiteral, Constexpr { using Constexpr::Constexpr; }; // expected-note {{base class 'NonLiteral' of non-literal type}}
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constexpr BothNonLiteral bothNL{42}; // expected-error {{constexpr variable cannot have non-literal type 'const BothNonLiteral'}}
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// FIXME: This diagnostic is not very good. We should explain that the problem is that base class NonConstexpr cannot be initialized.
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struct BothNonConstexpr
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: NonConstexpr,
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Constexpr {
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using Constexpr::Constexpr; // expected-note {{here}}
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};
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constexpr BothNonConstexpr bothNC{42}; // expected-error {{must be initialized by a constant expression}} expected-note {{inherited from base class 'Constexpr'}}
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struct ConstexprEval {
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constexpr ConstexprEval(int a, const char *p) : k(p[a]) {}
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char k;
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};
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struct ConstexprEval2 {
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char k2 = 'x';
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};
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struct ConstexprEval3 : ConstexprEval, ConstexprEval2 {
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using ConstexprEval::ConstexprEval;
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};
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constexpr ConstexprEval3 ce{4, "foobar"};
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static_assert(ce.k == 'a', "");
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static_assert(ce.k2 == 'x', "");
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struct TemplateCtors { // expected-note 2{{candidate constructor (the implicit}}
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constexpr TemplateCtors() {}
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template<template<int> class T> TemplateCtors(X<0>, T<0>); // expected-note {{here}} expected-note {{candidate inherited constructor}}
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template<int N> TemplateCtors(X<1>, X<N>); // expected-note {{here}} expected-note {{candidate inherited constructor}}
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template<typename T> TemplateCtors(X<2>, T); // expected-note {{here}} expected-note {{candidate inherited constructor}}
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template<typename T = int> TemplateCtors(int, int = 0, int = 0);
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};
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struct UsingTemplateCtors : TemplateCtors { // expected-note 3{{candidate constructor (the implicit}}
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using TemplateCtors::TemplateCtors; // expected-note 5{{inherited here}}
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constexpr UsingTemplateCtors(X<0>, X<0>) {} // expected-note {{not viable}}
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constexpr UsingTemplateCtors(X<1>, X<1>) {} // expected-note {{not viable}}
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constexpr UsingTemplateCtors(X<2>, X<2>) {} // expected-note {{not viable}}
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template<int = 0> constexpr UsingTemplateCtors(int) {} // expected-note {{not viable}}
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template<typename T = void> constexpr UsingTemplateCtors(int, int) {} // expected-note {{not viable}}
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template<typename T, typename U> constexpr UsingTemplateCtors(int, int, int) {} // expected-note {{couldn't infer}}
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};
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template<int> struct Y {};
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constexpr UsingTemplateCtors uct1{ X<0>{}, X<0>{} };
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constexpr UsingTemplateCtors uct2{ X<0>{}, Y<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr UsingTemplateCtors uct3{ X<1>{}, X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr UsingTemplateCtors uct4{ X<1>{}, X<1>{} };
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constexpr UsingTemplateCtors uct5{ X<2>{}, 0 }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
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constexpr UsingTemplateCtors uct6{ X<2>{}, X<2>{} };
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constexpr UsingTemplateCtors utc7{ 0 }; // ok
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constexpr UsingTemplateCtors utc8{ 0, 0 }; // ok
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// FIXME: The standard says that UsingTemplateCtors' (int, int, int) constructor
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// hides the one from TemplateCtors, even though the template parameter lists
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// don't match. It's not clear that that's *really* the intent, and it's not
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// what other compilers do.
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constexpr UsingTemplateCtors utc9{ 0, 0, 0 }; // expected-error {{no matching constructor}}
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