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// g++ -Wall -Wextra -Wpedantic -std=c++17 cpp/ch-2.cpp
#include <algorithm> // copy_if, reverse, transfomr
#include <iostream>
#include <sstream> // form the error message
#include <vector>
static constexpr double TOLERANCE = 1E-6;
bool is_vowel(char c) { c = std::tolower(c); return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'; }
std::string fun(const std::string_view str) {
std::vector<char> vowels;
std::copy_if(str.cbegin(), str.cend(), std::back_inserter(vowels), is_vowel);
std::reverse(vowels.begin(), vowels.end());
std::string new_str(str.size(), '\0');
auto vow_it = vowels.begin();
std::transform(str.cbegin(), str.cend(),
new_str.begin(), [&vow_it](char c) {
return
is_vowel(c)
? ('A' < c) && (c < 'Z')
? std::toupper(*vow_it++)
: std::tolower(*vow_it++)
: c;
});
return new_str;
}
int main() {
// Tests
std::vector<std::pair<std::string_view, std::string_view>> tests = {
{"Raku", "Ruka"},
{"Perl", "Perl"},
{"Julia", "Jaliu"},
{"Uiua", "Auiu"},
};
for (const auto& [input, expected_output] : tests) {
auto got = fun(input);
if (got != expected_output) {
std::stringstream error_msg;
error_msg << "Expected " << expected_output << ", got " << got;
throw std::runtime_error(error_msg.str());
}
}
std::cout << "done-testing, success\n";
}
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