Спринт 8. Можем лучше: совершенствуем парсинг строки. Задание 2.

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main.cpp
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#include <string_view>
#include <map>
#include <cassert>
#include <string>

using namespace std;

class Translator {
public:
    Translator() = default;

    void Add(string_view source, string_view target){
        russ_word_to_eng_word_[(string)(source)] = target;
        eng_word_to_russ_word_[(string)(target)] = source;
    }

    string_view TranslateForward(string_view source) const{
        if (russ_word_to_eng_word_.count((string)(source))){
            return russ_word_to_eng_word_.at((string)(source));
        }
        return{};
    }

    string_view TranslateBackward(string_view target) const{
        if (eng_word_to_russ_word_.count((string)(target))){
            return eng_word_to_russ_word_.at((string)(target));
        }
        return{};
    }

private:
    map<string, string> eng_word_to_russ_word_;
    map<string, string> russ_word_to_eng_word_;
};

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;
}
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my_assert.h
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