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Diffstat (limited to 'include/leveldb/slice.h')
-rw-r--r-- | include/leveldb/slice.h | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/include/leveldb/slice.h b/include/leveldb/slice.h deleted file mode 100644 index 62cb894..0000000 --- a/include/leveldb/slice.h +++ /dev/null @@ -1,104 +0,0 @@ -// Copyright (c) 2011 The LevelDB Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. See the AUTHORS file for names of contributors. -// -// Slice is a simple structure containing a pointer into some external -// storage and a size. The user of a Slice must ensure that the slice -// is not used after the corresponding external storage has been -// deallocated. - -#ifndef STORAGE_LEVELDB_INCLUDE_SLICE_H_ -#define STORAGE_LEVELDB_INCLUDE_SLICE_H_ - -#include <assert.h> -#include <stddef.h> -#include <string.h> -#include <string> - -namespace leveldb { - -class Slice { - public: - // Create an empty slice. - Slice() : data_(""), size_(0) { } - - // Create a slice that refers to data[0,n-1]. - Slice(const char* data, size_t n) : data_(data), size_(n) { } - - // Create a slice that refers to the contents of "s" - Slice(const std::string& s) : data_(s.data()), size_(s.size()) { } - - // Create a slice that refers to s[0,strlen(s)-1] - Slice(const char* s) : data_(s), size_(strlen(s)) { } - - // Return a pointer to the beginning of the referenced data - const char* data() const { return data_; } - - // Return the length (in bytes) of the referenced data - size_t size() const { return size_; } - - // Return true iff the length of the referenced data is zero - bool empty() const { return size_ == 0; } - - // Return the ith byte in the referenced data. - // REQUIRES: n < size() - char operator[](size_t n) const { - assert(n < size()); - return data_[n]; - } - - // Change this slice to refer to an empty array - void clear() { data_ = ""; size_ = 0; } - - // Drop the first "n" bytes from this slice. - void remove_prefix(size_t n) { - assert(n <= size()); - data_ += n; - size_ -= n; - } - - // Return a string that contains the copy of the referenced data. - std::string ToString() const { return std::string(data_, size_); } - - // Three-way comparison. Returns value: - // < 0 iff "*this" < "b", - // == 0 iff "*this" == "b", - // > 0 iff "*this" > "b" - int compare(const Slice& b) const; - - // Return true iff "x" is a prefix of "*this" - bool starts_with(const Slice& x) const { - return ((size_ >= x.size_) && - (memcmp(data_, x.data_, x.size_) == 0)); - } - - private: - const char* data_; - size_t size_; - - // Intentionally copyable -}; - -inline bool operator==(const Slice& x, const Slice& y) { - return ((x.size() == y.size()) && - (memcmp(x.data(), y.data(), x.size()) == 0)); -} - -inline bool operator!=(const Slice& x, const Slice& y) { - return !(x == y); -} - -inline int Slice::compare(const Slice& b) const { - const int min_len = (size_ < b.size_) ? size_ : b.size_; - int r = memcmp(data_, b.data_, min_len); - if (r == 0) { - if (size_ < b.size_) r = -1; - else if (size_ > b.size_) r = +1; - } - return r; -} - -} - - -#endif // STORAGE_LEVELDB_INCLUDE_SLICE_H_ |