add_const_t is an alias to the return type of the add_const meta‐function. Note, that the add_const_t avoids the ::type suffix and typename prefix when we want to use the result of the meta‐function in templates.
Synopsis
Declared in <bslmf_addconst.h>
template<class t_TYPE>
using add_const_t = add_const<t_TYPE>::type;
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