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I just read some recommendations on using
std::string s = get_string(); std::string t = another_string(); if( !s.compare(t) ) { instead of
if( s == t ) { I'm almost always using the last one because I'm used to it and it feels natural, more readable. I didn't even know that there was a separate comparison function. To be more precise, I thought == would call compare().
What are the differences? In which contexts should one way be favored to the other?
I'm considering only the cases where I need to know if a string is the same value as another string.
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You can't compare strings in C with ==, because the C compiler does not really have a clue about strings beyond a string-literal.
You should not use == (equality operator) to compare these strings because they compare the reference of the string, i.e. whether they are the same object or not. On the other hand, equals() method compares whether the value of the strings is equal, and not the object itself.
In String, the == operator is used to comparing the reference of the given strings, depending on if they are referring to the same objects. When you compare two strings using == operator, it will return true if the string variables are pointing toward the same java object. Otherwise, it will return false .
strcmp() in C/C++ The function strcmp() is a built-in library function and it is declared in “string. h” header file. This function is used to compare the string arguments. It compares strings lexicographically which means it compares both the strings character by character.
This is what the standard has to say about operator==
21.4.8.2 operator==
template<class charT, class traits, class Allocator> bool operator==(const basic_string<charT,traits,Allocator>& lhs, const basic_string<charT,traits,Allocator>& rhs) noexcept;Returns: lhs.compare(rhs) == 0.
Seems like there isn't much of a difference!
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