File: lambda-7.h

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gcc-arm-none-eabi 15%3A14.2.rel1-1
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struct S {
  int (*a)(int) = [](int x) { return x * 2; };

  int b(int x, int (*f)(int) = [](int x) { return x * 3; }) {
    return f(x);
  }

  static int c(int x, int (*f)(int) = [](int x) { return x * 4; }) {
    return f(x);
  }
};

inline int d(int x, int (*f)(int) = [](int x) { return x * 5; }) {
  return f(x);
}

// unevaluated lambdas
#if __cplusplus >= 202002L
struct E : decltype([](int x) { return x * 6; }) {
  decltype([](int x) { return x * 7; }) f;
};

template <typename T>
struct G : decltype([](int x) { return x * 8; }) {
  decltype([](int x) { return x * 9; }) h;
};

template <>
struct G<double> : decltype([](int x) { return x * 10; }) {
  decltype([](int x) { return x * 11; }) i;
};
#endif

// concepts
#if __cpp_concepts >= 201907L
template <typename T>
concept J = requires { []{ T(); }; };

template <typename T>
concept K = []{ return sizeof(T) == 1; }();
#endif