Long literals, with continuations: Difference between revisions

=={{header|C++}}==

<syntaxhighlight lang="c++">

#include <chrono>

#include <format>

#include <iostream>

#include <regex>

#include <sstream>

#include <string>

const std::string ELEMENTS = R"(

hydrogen helium lithium beryllium

boron carbon nitrogen oxygen

fluorine neon sodium magnesium

aluminum silicon phosphorous sulfur

chlorine argon potassium calcium

scandium titanium vanadium chromium

manganese iron cobalt nickel

copper zinc gallium germanium

arsenic selenium bromine krypton

rubidium strontium yttrium zirconium

niobium molybdenum technetium ruthenium

rhodium palladium silver cadmium

indium tin antimony tellurium

iodine xenon cesium barium

lanthanum cerium praseodymium neodymium

promethium samarium europium gadolinium

terbium dysprosium holmium erbium

thulium ytterbium lutetium hafnium

tantalum tungsten rhenium osmium

iridium platinum gold mercury

thallium lead bismuth polonium

astatine radon francium radium

actinium thorium protactinium uranium

neptunium plutonium americium curium

berkelium californium einsteinium fermium

mendelevium nobelium lawrencium rutherfordium

dubnium seaborgium bohrium hassium

meitnerium darmstadtium roentgenium copernicium

nihonium flerovium moscovium livermorium

tennessine oganesson

)";

const std::string UNNAMED_ELEMENTS = R"(

ununennium unquadnilium triunhexium penthextrium

penthexpentium septhexunium octenntrium ennennbium

)";

std::vector<std::string> rawstring_to_vector(const std::string& text, const char& delimiter) {

std::regex regx("\\s+");

std::string delimit(1, delimiter);

std::string elements = std::regex_replace(text, regx, delimit);

elements = elements.substr(1, elements.size() - 2);

std::vector<std::string> result;

std::stringstream stream(elements);

std::string item;

while ( getline(stream, item, delimiter) ) {

result.push_back (item);

}

return result;

}

int main() {

std::vector<std::string> elements = rawstring_to_vector(ELEMENTS, ' ');

std::vector<std::string> unnamed = rawstring_to_vector(UNNAMED_ELEMENTS, ' ');

elements.erase(std::remove_if(elements.begin(), elements.end(),

[unnamed](std::string text){ return std::find(unnamed.begin(), unnamed.end(), text) != unnamed.end(); }),

elements.end());

const std::string zone = "Asia/Shanghai";

const std::chrono::zoned_time zoned_time { zone, std::chrono::system_clock::now() };

std::cout << "Last revision Date: " << std::format("{:%Y-%m-%d Time %H:%M}", zoned_time) << " " << zone << std::endl;

std::cout << "Number of elements: " << elements.size() << std::endl;

std::cout << "Last element : " << elements[elements.size() - 1] << std::endl;

}

</syntaxhighlight>

{{ out }}

<pre>

Last revision Date: 2023-08-04 Time 00:18 Asia/Shanghai

Number of elements: 118

Last element : oganesson

</pre>