Constructor.

Synopsis

param(
    param const& other);

Description

Upon construction, this becomes a copy of other.

Postconditions

this->key == other.key && this->value == other.value && this->has_value == other.has_value

Complexity

Linear in other.key.size() + other.value.size().

Exception Safety

Calls to allocate may throw.

other The object to construct from.