LevelDB-course-Lab

小组成员：10215300402-朱维清 & 10222140408 谷杰

costan 201f77d137 Inline defaults in options. This CL moves default values for leveldb::{Options,ReadOptions,WriteOptions} from constructors to member declarations, and removes now-redundant comments stating the defaults. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=239271242		5 lat temu
..
c.h	Expose WriteBatch::Append in the C API.	6 lat temu
cache.h	Replace NULL with nullptr in C++ files.	6 lat temu
comparator.h	Add LEVELDB_EXPORT macro to export public symbols.	7 lat temu
db.h	Replace NULL with nullptr in C++ files.	6 lat temu
dumpfile.h	Add LEVELDB_EXPORT macro to export public symbols.	7 lat temu
env.h	Added native support for Windows.	5 lat temu
export.h	Add CMake build support.	6 lat temu
filter_policy.h	leveldb: Require C++11.	6 lat temu
iterator.h	Clean up Iterator.	6 lat temu
options.h	Inline defaults in options.	5 lat temu
slice.h	leveldb: Require C++11.	6 lat temu
status.h	Add move constructor to Status.	6 lat temu
table.h	Replace NULL with nullptr in C++ files.	6 lat temu
table_builder.h	leveldb: Require C++11.	6 lat temu
write_batch.h	leveldb: Make WriteBatch::ApproximateSize() const.	5 lat temu