123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
#include <iostream>
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using std::cin;
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using std::cout;
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using std::endl;
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#include <map>
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#include <set>
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void test_map() {
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std::map<std::string, int> msi;
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msi.insert(std::make_pair("Kalle", 1));
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msi.emplace("Lisa", 2);
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msi["Kim"] = 3;
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for (const auto &a : msi) {
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cout << a.first << " : " << a.second << endl;
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}
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cout << "Kim --> " << msi.at("Kim") << endl;
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cout << "Lisa --> " << msi["Lisa"] << endl;
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cout << "Hans --> " << msi["Hans"]
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<< endl; // [] default-konstruerar ett värde
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// för nycklar som inte finns
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try {
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cout << "Nisse --> " << msi.at("Nisse") << endl;
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} catch (std::out_of_range &e) {
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cout << "Nisse not found: " << e.what() << endl;
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}
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const auto &kim = msi.find("Kim");
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if (kim != msi.end()) {
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cout << "Kim : " << kim->second << endl;
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} else {
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cout << "Kim not found\n";
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}
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auto nisse = msi.find("Nisse");
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if (nisse != msi.end()) {
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cout << "Nisse : " << nisse->second << endl;
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} else {
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cout << "Nisse not found\n";
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}
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}
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void test_set() {
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std::set<int> ints{1, 3, 7};
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ints.insert(5);
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for (auto x : ints) {
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cout << x << " ";
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}
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cout << endl;
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auto has_one = ints.find(1);
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if (has_one != ints.end()) {
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cout << "one is in the set\n";
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} else {
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cout << "one is not in the set\n";
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}
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if (ints.count(1)) {
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cout << "one is in the set\n";
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} else {
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cout << "one is not in the set\n";
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}
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auto has_two = ints.find(2);
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if (has_two != ints.end()) {
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cout << "two is in the set\n";
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} else {
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cout << "two is not in the set\n";
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}
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if (ints.count(2)) {
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cout << "two is in the set\n";
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} else {
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cout << "two is not in the set\n";
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}
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auto has_five = ints.find(5);
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if (has_five != ints.end()) {
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cout << "five is in the set\n";
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} else {
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cout << "five is not in the set\n";
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}
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ints.erase(5);
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auto has_five_now = ints.find(5);
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if (has_five_now != ints.end()) {
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cout << "five is in the set\n";
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} else {
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cout << "five is not in the set\n";
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}
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}
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void test_set_bounds() {
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std::set<int> ints{9, 1, 3, 7, 5};
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auto lb3 = ints.lower_bound(3);
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cout << "lb3: " << *lb3 << endl;
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auto ub3 = ints.upper_bound(3);
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cout << "ub3: " << *ub3 << endl;
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auto lb4 = ints.lower_bound(4);
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cout << "lb4: " << *lb4 << endl;
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auto ub4 = ints.upper_bound(4);
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cout << "ub4: " << *ub4 << endl;
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auto er = ints.equal_range(7);
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if (er.first == er.second) {
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cout << "er.first == er.second";
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}
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cout << ", er.first: " << *er.first << ", er.second: " << *er.second
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<< endl;
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}
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int main() {
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test_map();
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test_set();
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test_set_bounds();
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}
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