122 lines
5.1 KiB
C++
122 lines
5.1 KiB
C++
// RUN: %clang_cc1 -std=c++11 -verify %s
|
|
|
|
template<int> struct X {};
|
|
|
|
// Constructor characteristics are:
|
|
// - the template parameter list
|
|
// - the parameter-type-list
|
|
// - absence or presence of explicit
|
|
// - absence or presence of constexpr
|
|
struct A {
|
|
A(X<0>) {} // expected-note 2{{here}}
|
|
constexpr A(X<1>) {}
|
|
explicit A(X<2>) {} // expected-note 3{{here}}
|
|
explicit constexpr A(X<3>) {} // expected-note 2{{here}}
|
|
};
|
|
|
|
A a0 { X<0>{} };
|
|
A a0i = { X<0>{} };
|
|
constexpr A a0c { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr A a0ic = { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
|
|
A a1 { X<1>{} };
|
|
A a1i = { X<1>{} };
|
|
constexpr A a1c { X<1>{} };
|
|
constexpr A a1ic = { X<1>{} };
|
|
|
|
A a2 { X<2>{} };
|
|
A a2i = { X<2>{} }; // expected-error {{constructor is explicit}}
|
|
constexpr A a2c { X<2>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr A a2ic = { X<2>{} }; // expected-error {{constructor is explicit}}
|
|
|
|
A a3 { X<3>{} };
|
|
A a3i = { X<3>{} }; // expected-error {{constructor is explicit}}
|
|
constexpr A a3c { X<3>{} };
|
|
constexpr A a3ic = { X<3>{} }; // expected-error {{constructor is explicit}}
|
|
|
|
|
|
struct B : A {
|
|
using A::A; // expected-note 7{{here}}
|
|
};
|
|
|
|
B b0 { X<0>{} };
|
|
B b0i = { X<0>{} };
|
|
constexpr B b0c { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr B b0ic = { X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
|
|
B b1 { X<1>{} };
|
|
B b1i = { X<1>{} };
|
|
constexpr B b1c { X<1>{} };
|
|
constexpr B b1ic = { X<1>{} };
|
|
|
|
B b2 { X<2>{} };
|
|
B b2i = { X<2>{} }; // expected-error {{constructor is explicit}}
|
|
constexpr B b2c { X<2>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr B b2ic = { X<2>{} }; // expected-error {{constructor is explicit}}
|
|
|
|
B b3 { X<3>{} };
|
|
B b3i = { X<3>{} }; // expected-error {{constructor is explicit}}
|
|
constexpr B b3c { X<3>{} };
|
|
constexpr B b3ic = { X<3>{} }; // expected-error {{constructor is explicit}}
|
|
|
|
|
|
// 'constexpr' is OK even if the constructor doesn't obey the constraints.
|
|
struct NonLiteral { NonLiteral(); };
|
|
struct NonConstexpr { NonConstexpr(); constexpr NonConstexpr(int); }; // expected-note {{here}}
|
|
struct Constexpr { constexpr Constexpr(int) {} };
|
|
|
|
struct BothNonLiteral : NonLiteral, Constexpr { using Constexpr::Constexpr; }; // expected-note {{base class 'NonLiteral' of non-literal type}}
|
|
constexpr BothNonLiteral bothNL{42}; // expected-error {{constexpr variable cannot have non-literal type 'const BothNonLiteral'}}
|
|
|
|
struct BothNonConstexpr : NonConstexpr, Constexpr { using Constexpr::Constexpr; }; // expected-note {{non-constexpr constructor 'NonConstexpr}}
|
|
constexpr BothNonConstexpr bothNC{42}; // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'BothNonConstexpr(42)'}}
|
|
|
|
|
|
struct ConstexprEval {
|
|
constexpr ConstexprEval(int a, const char *p) : k(p[a]) {}
|
|
char k;
|
|
};
|
|
struct ConstexprEval2 {
|
|
char k2 = 'x';
|
|
};
|
|
struct ConstexprEval3 : ConstexprEval, ConstexprEval2 {
|
|
using ConstexprEval::ConstexprEval;
|
|
};
|
|
constexpr ConstexprEval3 ce{4, "foobar"};
|
|
static_assert(ce.k == 'a', "");
|
|
static_assert(ce.k2 == 'x', "");
|
|
|
|
|
|
struct TemplateCtors {
|
|
constexpr TemplateCtors() {}
|
|
template<template<int> class T> TemplateCtors(X<0>, T<0>);
|
|
template<int N> TemplateCtors(X<1>, X<N>);
|
|
template<typename T> TemplateCtors(X<2>, T);
|
|
|
|
template<typename T = int> TemplateCtors(int, int = 0, int = 0); // expected-note {{inherited from here}}
|
|
};
|
|
|
|
struct UsingTemplateCtors : TemplateCtors { // expected-note 2{{candidate is the implicit}}
|
|
using TemplateCtors::TemplateCtors; // expected-note 4{{here}} expected-note {{candidate}}
|
|
|
|
constexpr UsingTemplateCtors(X<0>, X<0>) {}
|
|
constexpr UsingTemplateCtors(X<1>, X<1>) {}
|
|
constexpr UsingTemplateCtors(X<2>, X<2>) {}
|
|
|
|
template<int = 0> constexpr UsingTemplateCtors(int) {} // expected-note {{candidate}}
|
|
template<typename T = void> constexpr UsingTemplateCtors(int, int) {}
|
|
template<typename T, typename U> constexpr UsingTemplateCtors(int, int, int) {}
|
|
};
|
|
|
|
template<int> struct Y {};
|
|
constexpr UsingTemplateCtors uct1{ X<0>{}, X<0>{} };
|
|
constexpr UsingTemplateCtors uct2{ X<0>{}, Y<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr UsingTemplateCtors uct3{ X<1>{}, X<0>{} }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr UsingTemplateCtors uct4{ X<1>{}, X<1>{} };
|
|
constexpr UsingTemplateCtors uct5{ X<2>{}, 0 }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|
|
constexpr UsingTemplateCtors uct6{ X<2>{}, X<2>{} };
|
|
|
|
constexpr UsingTemplateCtors utc7{ 0 }; // expected-error {{ambiguous}}
|
|
constexpr UsingTemplateCtors utc8{ 0, 0 }; // ok
|
|
constexpr UsingTemplateCtors utc9{ 0, 0, 0 }; // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr}}
|