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example002_pi.cpp
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example002_pi.cpp
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///////////////////////////////////////////////////////////////////
// Copyright Christopher Kormanyos 2020 - 2024. //
// Distributed under the Boost Software License, //
// Version 1.0. (See accompanying file LICENSE_1_0.txt //
// or copy at http://www.boost.org/LICENSE_1_0.txt) //
///////////////////////////////////////////////////////////////////
#if (defined(__GNUC__) && !defined(__clang__) && (__GNUC__ >= 12))
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
#include <algorithm>
#include <cstdint>
#include <ctime>
#include <iostream>
// Disable heavyweight features via macros for this example.
#define WIDE_DECIMAL_DISABLE_IOSTREAM
#define WIDE_DECIMAL_DISABLE_DYNAMIC_MEMORY_ALLOCATION
#define WIDE_DECIMAL_DISABLE_CONSTRUCT_FROM_STRING
#define WIDE_DECIMAL_DISABLE_CACHED_CONSTANTS
#include <examples/example_decwide_t.h>
#include <math/constants/constants_pi_control_for_decwide_t.h>
#include <math/wide_decimal/decwide_t.h>
#include <mcal_lcd/mcal_lcd_console.h>
#include <util/memory/util_n_slot_array_allocator.h>
#include <util/utility/util_baselexical_cast.h>
namespace example002_pi
{
auto lcd0() -> mcal::lcd::lcd_base&
{
static mcal::lcd::lcd_console lc0;
return lc0;
}
} // namespace example002_pi
auto example002_pi_digits10_callback(const std::uint32_t d10) -> void
{
std::array<char, static_cast<std::size_t>(UINT32_C(10))> p_str = {{ '\0' }};
const char* p_end = util::baselexical_cast(d10, p_str.data(), p_str.data() + p_str.size()); // NOLINT(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
const auto len = static_cast<std::uint_fast8_t>(p_end - p_str.data());
example002_pi::lcd0().write(p_str.data(), len, 0U);
}
#if defined(WIDE_DECIMAL_NAMESPACE)
auto WIDE_DECIMAL_NAMESPACE::math::wide_decimal::example002_pi() -> bool
#else
auto ::math::wide_decimal::example002_pi() -> bool
#endif
{
using local_limb_type = std::uint32_t;
constexpr std::int32_t wide_decimal_digits10 = INT32_C(1000001);
#if defined(WIDE_DECIMAL_NAMESPACE)
constexpr std::int32_t local_elem_number =
WIDE_DECIMAL_NAMESPACE::math::wide_decimal::detail::decwide_t_helper<wide_decimal_digits10, local_limb_type>::elem_number;
#else
constexpr std::int32_t local_elem_number =
::math::wide_decimal::detail::decwide_t_helper<wide_decimal_digits10, local_limb_type>::elem_number;
#endif
#if defined(WIDE_DECIMAL_NAMESPACE)
constexpr std::int32_t local_elem_digits10 =
WIDE_DECIMAL_NAMESPACE::math::wide_decimal::detail::decwide_t_helper<wide_decimal_digits10, local_limb_type>::elem_digits10;
#else
constexpr std::int32_t local_elem_digits10 =
::math::wide_decimal::detail::decwide_t_helper<wide_decimal_digits10, local_limb_type>::elem_digits10;
#endif
using local_allocator_type = util::n_slot_array_allocator<void, local_elem_number, 18U>; // NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
#if defined(WIDE_DECIMAL_NAMESPACE)
using local_wide_decimal_type =
WIDE_DECIMAL_NAMESPACE::math::wide_decimal::decwide_t<wide_decimal_digits10, local_limb_type, local_allocator_type>;
#else
using local_wide_decimal_type =
::math::wide_decimal::decwide_t<wide_decimal_digits10, local_limb_type, local_allocator_type>;
#endif
const auto start = std::clock();
#if defined(WIDE_DECIMAL_NAMESPACE)
const local_wide_decimal_type my_pi =
WIDE_DECIMAL_NAMESPACE::math::wide_decimal::pi<wide_decimal_digits10, local_limb_type, local_allocator_type>(example002_pi_digits10_callback);
#else
const local_wide_decimal_type my_pi =
::math::wide_decimal::pi<wide_decimal_digits10, local_limb_type, local_allocator_type>(example002_pi_digits10_callback);
#endif
const auto stop = std::clock();
std::cout << "Time example002_pi() : "
<< static_cast<float>(stop - start) / static_cast<float>(CLOCKS_PER_SEC)
<< std::endl;
#if defined(WIDE_DECIMAL_NAMESPACE)
const auto head_is_ok = std::equal(my_pi.crepresentation().cbegin(),
my_pi.crepresentation().cbegin() + WIDE_DECIMAL_NAMESPACE::math::constants::const_pi_control_head_32.size(),
WIDE_DECIMAL_NAMESPACE::math::constants::const_pi_control_head_32.begin());
#else
const auto head_is_ok = std::equal(my_pi.crepresentation().cbegin(),
my_pi.crepresentation().cbegin() + ::math::constants::const_pi_control_head_32.size(),
::math::constants::const_pi_control_head_32.begin());
#endif
using const_iterator_type = typename local_wide_decimal_type::representation_type::const_iterator;
#if defined(WIDE_DECIMAL_NAMESPACE)
const_iterator_type
fi
(
my_pi.crepresentation().cbegin()
+ static_cast<std::uint32_t>
(
static_cast<std::uint32_t>(1UL + ((wide_decimal_digits10 - 1UL) / local_elem_digits10))
- static_cast<std::uint32_t>(WIDE_DECIMAL_NAMESPACE::math::constants::const_pi_control_tail_32_1000001.size())
)
);
#else
const_iterator_type
fi
(
my_pi.crepresentation().cbegin()
+ static_cast<std::uint32_t>
(
static_cast<std::uint32_t>(1UL + ((wide_decimal_digits10 - 1UL) / local_elem_digits10))
- static_cast<std::uint32_t>(::math::constants::const_pi_control_tail_32_1000001.size())
)
);
#endif
#if defined(WIDE_DECIMAL_NAMESPACE)
const auto tail_is_ok = std::equal(fi,
fi + WIDE_DECIMAL_NAMESPACE::math::constants::const_pi_control_tail_32_1000001.size(),
WIDE_DECIMAL_NAMESPACE::math::constants::const_pi_control_tail_32_1000001.begin());
#else
const auto tail_is_ok = std::equal(fi,
fi + ::math::constants::const_pi_control_tail_32_1000001.size(),
::math::constants::const_pi_control_tail_32_1000001.begin());
#endif
const auto result_is_ok = (head_is_ok && tail_is_ok);
return result_is_ok;
}
// Enable this if you would like to activate this main() as a standalone example.
#if defined(WIDE_DECIMAL_STANDALONE_EXAMPLE002_PI)
#include <iomanip>
#include <iostream>
auto main() -> int
{
const auto result_is_ok = ::math::wide_decimal::example002_pi();
std::cout << "result_is_ok: " << std::boolalpha << result_is_ok << std::endl;
}
#endif
#if (defined(__GNUC__) && !defined(__clang__) && (__GNUC__ >= 12))
#pragma GCC diagnostic pop
#endif