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1 // PR c++/88095
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2 // Test class non-type template parameters for literal operator templates.
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3 // Validate support for class template argument deduction.
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4 // { dg-do compile { target c++2a } }
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5
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6 namespace std {
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7 using size_t = decltype(sizeof(int));
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8 }
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9
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10 template <typename CharT, std::size_t N>
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11 struct fixed_string {
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12 constexpr static std::size_t length = N;
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13 constexpr fixed_string(...) { }
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14 // auto operator<=> (const fixed_string&) = default;
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15 };
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16 template <typename CharT, std::size_t N>
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17 fixed_string(const CharT (&str)[N]) -> fixed_string<CharT, N>;
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18
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19 template <fixed_string fs>
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20 constexpr std::size_t operator"" _udl() {
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21 return decltype(fs)::length;
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22 }
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23
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24 static_assert("test"_udl == 5);
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