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131
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1 // { dg-do compile { target c++17 } }
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2 // { dg-options "-fconcepts" }
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111
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3
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4 template<typename T>
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5 concept bool C1 = __is_same_as(T, int);
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6
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7 template<int N>
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8 concept bool C2 = N == 0;
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9
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10 template<template<typename> class X>
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11 concept bool C3 = true;
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12
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13 template<typename> struct Foo;
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14
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15 // Type template parameters
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16 template<C1 T = int> struct S1 { };
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17 template<C1 = int> struct S2;
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18 template<C1 T> struct S2 { };
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19
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20 // Non-type template parameters
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21 template<C2 N = 0> struct S3 { };
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22 template<C2 = 0> struct S4;
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23 template<C2 N> struct S4 { };
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24
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25 // Template template parameters
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26 template<C3 X = Foo> struct S5 { };
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27 template<C3 = Foo> struct S6;
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28 template<C3 X> struct S6 { };
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29
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30 S1<> s1;
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31 S2<> s2;
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32 S3<> s3;
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33 S4<> s4;
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34 S5<> s5;
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35 S6<> s6;
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