Compile-Time

Variadic Tuple Printer

Difficulty

Asked at XTX Markets, Flow Traders

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xxxxxxxx xxxxxxxxx xxx xxxx xxxxxxx xxx xxxx xx xxxxxxxxxxxxx xxxx: x xxxxxx, x xxxxxxxx, x xxxxx, x xxxxxxxxx, xxxx xxxxxx x xxxxxxxxx xxxx. xx x++ xxxx xxx xx x xxx::xxxxx, xxx xxxxxxx "xxx xxxxx" xxxx x xxxxxxxxx xxxx xx xxx xxxxxxxxx xxxxxxxx xx xxxxxxxx xxxxxxxxx: xxxxxxx x xxxx xxxx xxxxx xxxxx xxxxxxx xxx x xxxxxxxxx xxxx, xx x xxxxxxx xxx xxxx xxxxxx xxxxx xx.

xxxxxxxxx xxxxx xxxxxxxx xxxxxxxxx xxxx xxxxxx xxxxx xxxxxxxx xxx xxxxxxx xx xxx, xxxx xxxx, xxxxxx xxx xxx::xxxxxx:

x. xxx::xxxxxx xxxxxx_xxx(xxxxx xxx::xxxxx<xx...>&): xxxxx xxxx xxxxxxxxx, xxxxxx xxxx '|' (xx xxxxxxx xx xxxxxxxx xxxxxxxxx, xxxxx xxxxx xxxxx ""). xxx-xxxx xxxxxxxxxx:

xxxxxxxx: xxxxxxx xxxxxx (xxx::xx_xxxxxx);
xxxxxx: xxxxx xxx xxxxxxxx, xxxxxxxx xx xxxxxxx xxx xxxxxxxx: xxx::xxxxxxx(xxxxx * xxx.x), xxxx xxxxxxxx xxxxxxxx xxxx xxxx xxxxxxx (xxxx, xxxxx xxxx, xxxx-xxxxxx xxx-xxxxx xxxxxxxx). xxxxxx xxx xxxxxxx xxxxx, xx x xxxxxxxx xxxx xxxxxx xx xxxx xxxxxx x.xx. xx xxx::xxxxxx, xx xxxxxxx;
xxx::xxxxxx: xxxxxxxx. x. xxxxxxxxx xxx::xxxx_x xxxxxx_xxxxx(xxxxx xxx::xxxxx<xx...>&): xxx xxxxxx xx xxxxxxx, xxxxxx xx x xxxxxxxx xxxxxxxxxx. x. xxxx xxxx xxx_xxxxxxxxx(xxxxx xxx::xxxxx<xx...>&): xxx xxx xx xxx xxxxxxxx xxxxx xxxx, xxxxxxxx xxxxxx xxx xxx::xxxxxx xxxxx xx xxxxxxx xxxx (xx xxxxxxxxx, xxx xxxxxxx xxxxxxxxx xx xxxx xxx).

xxxx xxxxxxxxxxx xxxx xx xxxxxxxxx xxx xxx xxxxxxxx xxxxx; xxx::xxxxx xxxxx xxx xxx xxxxxxxx xx x xxxx.

xxxxxxxx

xxxxxx_xxx(xxx::xxxxx<xxx, xxx::xxxxxx, xxxxxx>(xx, xxx::xxxxxx("xxxx"), x.xxxxx))
// "xx|xxxx|x.xx"

[]{ xxxx xxxxx = xxx::xxxxx<>(); xxxx xxx = xxx::xxxxx<xxx>(x); xxxxxx xxx::xxxxx<xxx::xxxxxx, xxxx xxxx, xxx::xxxxxx, xxxx xxxx>(xxxxxx_xxx(xxxxx), xxxxxx_xxxx<xxxx xxxx>(xxxxxx_xxxxx(xxxxx)), xxxxxx_xxx(xxx), xxxxxx_xxxx<xxxx xxxx>(xxxxxx_xxxxx(xxx))); }()
// ("", x, "x", x)

xxxxxxxxxxx

xxxxxxx xxxxx xxx xxxxxxx xxx, xxxx xxxx, xxxxxx, xxx::xxxxxx; xxxxxx xxxx x xx x xxxxxxxx.
xxxxxxx xxxxxxx (|x| < xx^{xx}), xx xxx xxxxxx xxxxx xxxx x xxxx xxxx. xxx xxxxxx xxxxxxxx xxxxxx xxxxxxx xxxxxx xxxx xxxxxxx xxxxxxxxx: -x.xxx xxxxxx xx -xxx.xxx... xxx xxxxxx -x.xx, xxxxx x.xxx xxxxxx xx xxxxxxx xxx.x xxxxx xxx xxxxxxxx'x xxx xxxxxxxx xxx xxxxxx x.xx. xxxxxx xxx xxxxxxx xxxxxx xxx xxx xxxx xxxxx; xxxx-xxxxxx xxxxxxx xxxxxx xxxxxx xxxx xxx.
xxx xxxxx xxxxxxxxx xxxx xxxx xxx xxx xxxxxxxxxx xxxxx xxxxx, xxxxxxxxx xxx xxxxx xxxxx, xxx xxxxxxx xxxx xxxx xxxxxxx xxxxx (x xxxxxxxxx xxx xx xxxxxx x xxxxx xxxxxx xxxx).
xxxx xxx xxxxx xxxxxxxxxx.

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Language: C++format_row

#include <cmath>
#include <cstddef>
#include <string>
#include <tuple>
#include <type_traits>

// ...
// ...
// ...
// ...
// ...
// ...

// ...
template <typename... Ts>
std::string format_row(const std::tuple<Ts...>& row) {
    // ...
    (void)row;
    return std::string();
}

// ...
template <typename... Ts>
constexpr std::size_t column_count(const std::tuple<Ts...>& row) {
    // ...
    (void)row;
    return 0;
}

// ...
// ...
template <typename... Ts>
long long sum_integrals(const std::tuple<Ts...>& row) {
    // ...
    (void)row;
    return 0;
}

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