is_specialized.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// test numeric_limits

// Specializations shall be provided for each arithmetic type, both floating
// point and integer, including bool. The member is_specialized shall be
// true for all such specializations of numeric_limits.

// Non-arithmetic standard types, such as complex<T> (26.3.2), shall not
// have specializations.

// From [numeric.limits]:

// The value of each member of a specialization of numeric_limits on a cv
// -qualified type cv T shall be equal to the value of the corresponding
// member of the specialization on the unqualified type T.

// More convenient to test it here.

#include <limits>
#include <complex>

#include "type_algorithms.h"

struct Test {
  template <class T>
  void operator()() {
    static_assert(std::numeric_limits<T>::is_specialized,
                 "std::numeric_limits<T>::is_specialized");
    static_assert(std::numeric_limits<const T>::is_specialized,
                 "std::numeric_limits<const T>::is_specialized");
    static_assert(std::numeric_limits<volatile T>::is_specialized,
                 "std::numeric_limits<volatile T>::is_specialized");
    static_assert(std::numeric_limits<const volatile T>::is_specialized,
                 "std::numeric_limits<const volatile T>::is_specialized");
  }
};

int main(int, char**)
{
  meta::for_each(meta::arithmetic_types(), Test());

  static_assert(!std::numeric_limits<std::complex<double> >::is_specialized,
                "!std::numeric_limits<std::complex<double> >::is_specialized");

  return 0;
}