Specialize formatter
for all std::basic_string
types
#3943
Merged
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This fixes #3938 by adding a
formatter
partial specialization that covers allstd::basic_string
types, such asstd::pmr::string
.Additionally, this adds the old-school allocator member types to
mock_allocator
in order to make GCC 4.8 happy. If GCC 4.8 support is removed in the future, these member types can be removed as they are the defaults ofallocator_traits
.