Many area of the code are splattered with unneeded templates. This patchset replaces
some of them, where the template parameter is a function object, with an std::function
or noncopyable_function (with a preference towards the latter; but it is not always
possible). As the template is compiled for each instantiation (if the function
object is a lambda) while a function is compiled only once, there are significant
savings in compile time and bloat.
text data bss dec hex filename
85160690 42120 284910 85487720 5187068 scylla.before
84824762 42120 284910 85151792 5135030 scylla.after
* https://github.com/avikivity/scylla detemplate/v2:
api/commitlog: de-template acquire_cl_metric()
database: de-template do_parse_schema_tables
database: merge for_all_partitions and for_all_partitions_slow
hints: de-template scan_for_hints_dirs()
schema_tables: partially de-template make_map_mutation()
distributed_loader: de-template
tests: commitlog_test: de-template
tests: cql_auth_query_test: de-template
test: de-template eventually() and eventually_true()
tests: flush_queue_test: de-template
hint_test: de-template
tests: mutation_fragment_test: de-template
test: mutation_test: de-template
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