emplace_back
// vector::emplace_back
#include <iostream>
#include <vector>
int main ()
{
std::vector<int> myvector = {10,20,30};
myvector.emplace_back (100);
myvector.emplace_back (200);
std::cout << "myvector contains:";
for (auto& x: myvector)
std::cout << ' ' << x;
std::cout << '\n';
return 0;
}emplace_back vector c++
#include <vector>
#include <string>
#include <cassert>
#include <iostream>
struct President
{
std::string name;
std::string country;
int year;
President(std::string p_name, std::string p_country, int p_year)
: name(std::move(p_name)), country(std::move(p_country)), year(p_year)
{
std::cout << "I am being constructed.\n";
}
President(President&& other)
: name(std::move(other.name)), country(std::move(other.country)), year(other.year)
{
std::cout << "I am being moved.\n";
}
President& operator=(const President& other) = default;
};
int main()
{
std::vector<President> elections;
std::cout << "emplace_back:\n";
auto& ref = elections.emplace_back("Nelson Mandela", "South Africa", 1994);
assert(ref.year != 1984 && "uses a reference to the created object (C++17)");
std::vector<President> reElections;
std::cout << "\npush_back:\n";
reElections.push_back(President("Franklin Delano Roosevelt", "the USA", 1936));
std::cout << "\nContents:\n";
for (President const& president: elections) {
std::cout << president.name << " was elected president of "
<< president.country << " in " << president.year << ".\n";
}
for (President const& president: reElections) {
std::cout << president.name << " was re-elected president of "
<< president.country << " in " << president.year << ".\n";
}
}Copyright © 2021 Codeinu
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