What is the use of has_value() function in any container?

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answerhappygod
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What is the use of has_value() function in any container?

Post by answerhappygod »

a) Used to destroys the contained object in any variable
b) Used to change the object any container is holding
c) Used to return the type information about the any container
d) Used to check whether any container is empty or not
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