c-resources/CPlusPlus20ForProgrammers-m.../examples/ch13/fig13_08.cpp

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// fig13_08.cpp
// Standard library multimap class template.
#include <fmt/format.h> // C++20: This will be #include <format>
#include <iostream>
#include <map> // multimap class-template definition
int main() {
std::multimap<int, double> pairs{}; // create multimap
std::cout << fmt::format("Number of 15 keys in pairs: {}\n",
pairs.count(15));
// insert two pairs
pairs.insert(std::make_pair(15, 99.3));
pairs.insert(std::make_pair(15, 2.7));
std::cout << fmt::format("Number of 15 keys in pairs: {}\n\n",
pairs.count(15));
// insert five pairs
pairs.insert({30, 111.11});
pairs.insert({10, 22.22});
pairs.insert({25, 33.333});
pairs.insert({20, 9.345});
pairs.insert({5, 77.54});
std::cout << "Multimap pairs contains:\nKey\tValue\n";
// walk through elements of pairs
for (const auto& mapItem : pairs) {
std::cout << fmt::format("{}\t{}\n", mapItem.first, mapItem.second);
}
}
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