C++ std::vector emplace vs insert [duplicate]
Emplace takes the arguments necessary to construct an object in place, whereas insert takes (a reference to) an object.
struct Foo
{
Foo(int n, double x);
};
std::vector<Foo> v;
v.emplace(someIterator, 42, 3.1416);
v.insert(someIterator, Foo(42, 3.1416));
insert copies objects into the vector.
emplace construct them inside of the vector.