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param::param (3 of 4 overloads)

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.

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