muduo:String Piece
12871 ワード
http://www.zhihu.com/question/34499426/answer/58891014 なぜこのクラスが必要ですか?C++の中にはstringとchar*がありますが、const string&sを関数としてイメージすると、2つの文字列が同時に互換できます.しかし、長いchar*に入ると、大きなstringオブジェクトが生成されます.費用がかかります.もしあなたの目的が文字列の値を読むだけなら、このStringPieceを使うと、4+1つのポインタだけのメモリがかかり、互換性も保証されます.したがって、このクラスの目的は、文字列の入力面の値であり、その内部のptr_このメモリは彼のものではない.だから何も変えられません.
#ifndef MUDUO_BASE_STRINGPIECE_H
#define MUDUO_BASE_STRINGPIECE_H
#include
#include // for ostream forward-declaration
#include
#ifndef MUDUO_STD_STRING
#include
#endif
namespace muduo {
// For passing C-style string argument to a function.
class StringArg // copyable
{
public:
StringArg(const char* str)
: str_(str)
{ }
StringArg(const string& str)
: str_(str.c_str())
{ }
#ifndef MUDUO_STD_STRING
StringArg(const std::string& str)
: str_(str.c_str())
{ }
#endif
const char* c_str() const { return str_; }
private:
const char* str_;
};
class StringPiece {
private:
const char* ptr_;
int length_;
public:
// We provide non-explicit singleton constructors so users can pass
// in a "const char*" or a "string" wherever a "StringPiece" is
// expected.
StringPiece()
: ptr_(NULL), length_(0) { }
StringPiece(const char* str)
: ptr_(str), length_(static_cast<int>(strlen(ptr_))) { }
StringPiece(const unsigned char* str)
: ptr_(reinterpret_cast<const char*>(str)),
length_(static_cast<int>(strlen(ptr_))) { }
StringPiece(const string& str)
: ptr_(str.data()), length_(static_cast<int>(str.size())) { }
#ifndef MUDUO_STD_STRING
StringPiece(const std::string& str)
: ptr_(str.data()), length_(static_cast<int>(str.size())) { }
#endif
StringPiece(const char* offset, int len)
: ptr_(offset), length_(len) { }
// data() may return a pointer to a buffer with embedded NULs, and the
// returned buffer may or may not be null terminated. Therefore it is
// typically a mistake to pass data() to a routine that expects a NUL
// terminated string. Use "as_string().c_str()" if you really need to do
// this. Or better yet, change your routine so it does not rely on NUL
// termination.
const char* data() const { return ptr_; }
int size() const { return length_; }
bool empty() const { return length_ == 0; }
const char* begin() const { return ptr_; }
const char* end() const { return ptr_ + length_; }
void clear() { ptr_ = NULL; length_ = 0; }
void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
void set(const char* str) {
ptr_ = str;
length_ = static_cast<int>(strlen(str));
}
void set(const void* buffer, int len) {
ptr_ = reinterpret_cast<const char*>(buffer);
length_ = len;
}
char operator[](int i) const { return ptr_[i]; }
void remove_prefix(int n) {
ptr_ += n;
length_ -= n;
}
void remove_suffix(int n) {
length_ -= n;
}
bool operator==(const StringPiece& x) const {
return ((length_ == x.length_) &&
(memcmp(ptr_, x.ptr_, length_) == 0));
}
bool operator!=(const StringPiece& x) const {
return !(*this == x);
}
#define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp) \
bool operator cmp (const StringPiece& x) const { \
int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_); \
return ((r auxcmp 0) || ((r == 0) && (length_ cmp x.length_))); \
}
STRINGPIECE_BINARY_PREDICATE(=, >);
STRINGPIECE_BINARY_PREDICATE(>, >);
#undef STRINGPIECE_BINARY_PREDICATE
int compare(const StringPiece& x) const {
int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_);
if (r == 0) {
if (length_ < x.length_) r = -1;
else if (length_ > x.length_) r = +1;
}
return r;
}
string as_string() const {
return string(data(), size());
}
void CopyToString(string* target) const {
target->assign(ptr_, length_);
}
#ifndef MUDUO_STD_STRING
void CopyToStdString(std::string* target) const {
target->assign(ptr_, length_);
}
#endif
// Does "this" start with "x"
bool starts_with(const StringPiece& x) const {
return ((length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0));
}
};
} // namespace muduo
// ------------------------------------------------------------------
// Functions used to create STL containers that use StringPiece
// Remember that a StringPiece's lifetime had better be less than
// that of the underlying string or char*. If it is not, then you
// cannot safely store a StringPiece into an STL container
// ------------------------------------------------------------------
#ifdef HAVE_TYPE_TRAITS
// This makes vector really fast for some STL implementations
template<> struct __type_traits<:stringpiece> {
typedef __true_type has_trivial_default_constructor;
typedef __true_type has_trivial_copy_constructor;
typedef __true_type has_trivial_assignment_operator;
typedef __true_type has_trivial_destructor;
typedef __true_type is_POD_type;
};
#endif
// allow StringPiece to be logged
std::ostream& operator<std::ostream& o, const muduo::StringPiece& piece);
#endif // MUDUO_BASE_STRINGPIECE_H
この二つの関数を理解してください. void remove_prefix(int n) {
ptr_ += n;
length_ -= n;
}
void remove_suffix(int n) {
length_ -= n;
}