On 20/12/2016 20:49, Black Michael wrote:
With the "old" way the ShowControls value always hits the default on
reading.
With the SettingsGroup it reads it correctly.
Hi Mike,
those are not equivalent. In what you call the "old" way the settings
group is closed just after setRxRange(m_fMin) but the so called "new"
way only closes the settings group when the SettingsGroup object
instance goes out of scope, which is the closing brace of the constructor.
I suggest you look at the implementation of SettingsGroup and do a bit
of research on "Resource Acquisition Is Initialization" (RAII) a.k.a.
Execute Around. This is a fundamental idiom in modern C++ for writing
code with exception safety guarantees when dealing with various resources.
73
Bill
G4WJS.
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