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Showing content from https://timsong-cpp.github.io/cppwp/n4140/list.capacity below:

[list.capacity]

23.3.5.3 list capacity [list.capacity]

void resize(size_type sz);

Effects: If size() < sz, appends sz - size() default-inserted elements to the sequence. If sz <= size(), equivalent to

list<T>::iterator it = begin();
advance(it, sz);
erase(it, end());

Requires: T shall be DefaultInsertable into *this.

void resize(size_type sz, const T& c);

Effects:

if (sz > size())
  insert(end(), sz-size(), c);
else if (sz < size()) {
  iterator i = begin();
  advance(i, sz);
  erase(i, end());
}
else
  ;                 

Requires: T shall be CopyInsertable into *this.


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