The initialization and assignment operation in C is very large.
There is no difference in basic data types:
such as:
INT A = 12; // Initialization, Copy 0x000c to aa = 12; // Assignment, Copy 0x000c to A But the user-defined data type is much larger than the String initialization and assignment.
Class string {public: String (const char * init); // intendsaLiNIT); String (); string (const string & That); string & operator = (const string & That); string & operator = (const char * STR); Void Swap (String & That); Friend Const String // Concatenate Operator ; Friend Bool Operator <(Const String &, Const String &); // ... private: string (const char *, const gran *); // computational char * s_;}; initialization construction process is relatively simple: allocate a large space and then fill the data: string :: string (const char * init) {if (! init INIT = ""; s_ = new char [strlen (init) 1]; strcpy (s_, init);} Destructure process is simpler: String :: ~ String () {delete [] s_;}
But if the assignment is more complicated: string & string :: Operator = (const char * str) {
IF (! Str) str = ""
Char * TMP = STRCPY (New Char [Strlen (STR) 1], STR);
delete [] s_;
S_ = TMP;
RETURN * THIS;
}
It seems that it is best to assign a value when it is initialized, and avoids the value of = number. Related Links: C Common Knowledge: Assignment and Initialization Are Different Other Robots Chat
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