Annex D (normative) Compatibility features [depr]

D.19 Deprecated basic_­string capacity [depr.string.capacity]

1
#
The following member is declared in addition to those members specified in [string.capacity]: 
namespace std {
  template<class charT, class traits = char_traits<charT>,
           class Allocator = allocator<charT>>
  class basic_string {
  public:
    void reserve();
  };
}
🔗
void reserve();
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Effects: After this call, capacity() has an unspecified value greater than or equal to size().
[Note
:
This is a non-binding shrink to fit request.
— end note
]