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xo-ratio: expand example ex1.cpp

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This commit is contained in:
Roland Conybeare 2024-04-18 17:07:50 -04:00
commit 0c7cb8c37e
1 changed files with 85 additions and 1 deletions
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86
example/ex1/ex1.cpp
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@ -1,13 +1,75 @@
/** @file ex1.cpp **/
#include "xo/ratio/ratio_iostream.hpp"
#include "xo/indentlog/scope.hpp"
#include "xo/indentlog/print/hex.hpp"
#include <iostream>
namespace {
using xo::xtag;
using xo::hex_view;
#ifdef NOT_USING
template <std::size_t N>
xo::flatstring<N>
flatstring_from_int(int x)
{
XO_SCOPE(log, always);
constexpr size_t buf_z = 20;
bool negative_flag = (x < 0);
std::size_t i = buf_z;
char buf[buf_z];
std::fill_n(buf, N, '\0');
if (negative_flag)
x = -x;
buf[--i] = '\0';
while ((i > 0) && (x != 0)) {
buf[--i] = ('0' + x % 10);
x = x / 10;
}
if ((i > 0) && negative_flag)
buf[--i] = '-';
char retv[N];
std::fill_n(retv, N, '\0');
std::copy_n(buf + i, buf_z - i, retv);
log && log(xtag("i",i), xtag("buf[i..]", hex_view(buf+i, buf+buf_z, true)));
return retv;
}
#endif
template <typename Ratio, std::size_t N>
constexpr xo::flatstring<N>
ratio_to_str(Ratio x) noexcept
{
if (x.is_integer()) {
return xo::flatstring<N>::from_int(x.num());
} else {
constexpr auto num_str = xo::flatstring<N>::from_int(x.num());
constexpr auto den_str = xo::flatstring<N>::from_int(x.den());
constexpr auto tmp = flatstring_concat("(", num_str, "/", den_str, ")");
return tmp;
}
}
}
int
main() {
using xo::ratio::make_ratio;
using xo::ratio::ratio;
using xo::ratio::ratio_concept;
using xo::flatstring;
using namespace std;
constexpr auto r1 = make_ratio(2, 3);
@ -158,11 +220,24 @@ main() {
static_assert(!r16.is_integer());
constexpr auto r17 = 2 / r9;
cerr << "r17=2/r9: " << r17 << endl;
cerr << "r17=2/r9: " << r17 << endl; // 9/2
static_assert(r17 == ratio(9, 2));
static_assert(!r17.is_integer());
constexpr auto s17_num_str = flatstring<20>::from_int(r17.num());
static_assert(s17_num_str == flatstring("9"));
constexpr auto s17_den_str = flatstring<20>::from_int(r17.den());
static_assert(s17_den_str == flatstring("2"));
constexpr auto s17_str = flatstring_concat(flatstring_concat(flatstring("("),
s17_num_str),
flatstring_concat(flatstring("/"),
s17_den_str),
flatstring(")"));
cerr << "s17_str=" << s17_str << endl;
//constexpr auto s17 = ratio_to_str<decltype(r17), 20>(r17);
constexpr auto r18 = r12 / r8;
cerr << "r18=r12/r8: " << r12/r8 << endl;
@ -180,6 +255,15 @@ main() {
static_assert(!r20.is_integer());
static_assert(r20 == ratio(8, 729));
//cerr << flatstring_from_int<10>(1) << endl;
constexpr auto s20 = flatstring<10>::from_int(-123);
cerr << "s20=" << s20 << endl;
static_assert(s20.size() > 0);
static_assert(s20 == flatstring("-123"));
/* verify constexpr working */
static_assert(ratio<int>(2,3).num() == 2);
static_assert(ratio<int>(2,3).den() == 3);