这是标准对 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; 
 

返回：lhs.compare（rhs）== 0。 p>

看起来没什么区别！

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.

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!