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RobertDeMilo

Jun 9th, 2024

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/////////////////////////////////////////////////////////////////////////////
String_view 1/2
#include <cassert>
#include <iostream>
#include <string_view>
#include <vector>
using namespace std;
vector<string_view> SplitIntoWordsView(string_view str) {
vector<string_view> result;
str.remove_prefix(std::min(str.size(), str.find_first_not_of(' ')));
const int64_t pos_end = str.npos;
while (!str.empty())
{
int64_t space = str.find(' ');
result.push_back(space == pos_end ? str.substr(0, str.size()) : str.substr(0, space));
str.remove_prefix(std::min(str.size(), str.find_first_not_of(' ', space)));
}
return result;
}
int main() {
assert((SplitIntoWordsView("") == vector<string_view>{}));
assert((SplitIntoWordsView(" ") == vector<string_view>{}));
assert((SplitIntoWordsView("aaaaaaa") == vector{ "aaaaaaa"sv }));
assert((SplitIntoWordsView("a") == vector{ "a"sv }));
assert((SplitIntoWordsView("a b c") == vector{ "a"sv, "b"sv, "c"sv }));
assert((SplitIntoWordsView("a bbb cc") == vector{ "a"sv, "bbb"sv, "cc"sv }));
assert((SplitIntoWordsView(" a bbb cc") == vector{ "a"sv, "bbb"sv, "cc"sv }));
assert((SplitIntoWordsView("a bbb cc ") == vector{ "a"sv, "bbb"sv, "cc"sv }));
assert((SplitIntoWordsView(" a bbb cc ") == vector{ "a"sv, "bbb"sv, "cc"sv }));
cout << "All OK" << endl;
}
//////////////////////////////////////////////////////////////////
#include <iostream>
#include <map>
#include <string_view>
#include <cassert>
using namespace std;
class Translator {
public:
Translator() = default;
void Add(string_view source, string_view target) {
russian_to_english_.insert(pair{source, target});
english_to_russian_.insert(pair{target, source});
}
string_view TranslateForward(string_view source) const {
if (auto search = russian_to_english_.find(static_cast<string>(source)); search != russian_to_english_.end()) {
return search->second;
}
return {};
}
string_view TranslateBackward(string_view target) const {
if (auto search = english_to_russian_.find(static_cast<string>(target)); search != english_to_russian_.end()) {
return search->second;
}
return {};
}
private:
map<string, string> russian_to_english_{};
map<string, string> english_to_russian_{};
};
void TestSimple() {
Translator translator;
translator.Add(string("okno"s), string("window"s));
translator.Add(string("stol"s), string("table"s));
assert(translator.TranslateForward("okno"s) == "window"s);
assert(translator.TranslateBackward("table"s) == "stol"s);
assert(translator.TranslateForward("table"s) == ""s);
}
int main() {
TestSimple();
return 0;
}
///////////////////////////////////////////////////////////////////////////
String_view
#include<iostream>
#include<algorithm>
#include<string_view>
#include<string>
#include<vector>
#include "log_duration.h"
using namespace std;
vector<string> SplitIntoWords(const string& text) {
vector<string> words;
string word;
for (const char c : text) {
if (c == ' ') {
if (!word.empty()) {
// обратите внимание на это место в коде
// здесь мы каждый раз копируем найденное слово
// в новый элемент в векторе
words.push_back(word);
word.clear();
}
}
else {
word += c;
}
}
if (!word.empty()) {
words.push_back(word);
}
return words;
}

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