#include <iostream>
#include <map>
void println(auto rem, const auto& container)
{
std::cout << rem << '{';
for (char sep[]{0, ' ', 0}; const auto& [key, value] : container)
std::cout << sep << '{' << key << ", " << value << '}', *sep = ',';
std::cout << "}\n";
}
int main()
{
std::multimap<int, char> data
{
{1, 'a'}, {2, 'b'}, {3, 'c'}, {4, 'd'},
{5, 'e'}, {4, 'f'}, {5, 'g'}, {5, 'g'},
};
println("Original:\n", data);
const auto count = std::erase_if(data, [](const auto& item)
{
const auto& [key, value] = item;
return (key & 1) == 1;
});
println("Erase items with odd keys:\n", data);
std::cout << count << " items removed.\n";
}
Original:
{{1, a}, {2, b}, {3, c}, {4, d}, {4, f}, {5, e}, {5, g}, {5, g}}
Erase items with odd keys:
{{2, b}, {4, d}, {4, f}}
5 items removed.
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