Add to this time interval the number of seconds represented by the specified integral number of hours, and return a reference providing modifiable access to this object. The behavior is undefined unless the number of seconds in hours, and the total number of seconds in the resulting time interval, can both be represented with 64-bit signed integers. Note that hours may be negative.
Declared in <bsls_timeinterval.h>
constexpr
TimeInterval&
addHours(bsls::Types::Int64 hours);