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    libstdc++
    
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Public Types | |
| enum class | _Construct { _Token } | 
Public Member Functions | |
| constexpr | nullopt_t (_Construct) | 
Tag type to disengage optional objects.
Definition at line 83 of file experimental/optional.
      
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  strong | 
Definition at line 90 of file experimental/optional.
      
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  inlineexplicitconstexpr | 
Definition at line 93 of file experimental/optional.