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Showing content from https://cplusplus.com/reference/string/string/operators/ below:

function

relational operators (string) (1)

bool operator== (const string& lhs, const string& rhs);bool operator== (const char*   lhs, const string& rhs);bool operator== (const string& lhs, const char*   rhs);

(2)

bool operator!= (const string& lhs, const string& rhs);bool operator!= (const char*   lhs, const string& rhs);bool operator!= (const string& lhs, const char*   rhs);

(3)

bool operator<  (const string& lhs, const string& rhs);bool operator<  (const char*   lhs, const string& rhs);bool operator<  (const string& lhs, const char*   rhs);

(4)

bool operator<= (const string& lhs, const string& rhs);bool operator<= (const char*   lhs, const string& rhs);bool operator<= (const string& lhs, const char*   rhs);

(5)

bool operator>  (const string& lhs, const string& rhs);bool operator>  (const char*   lhs, const string& rhs);bool operator>  (const string& lhs, const char*   rhs);

(6)

bool operator>= (const string& lhs, const string& rhs);bool operator>= (const char*   lhs, const string& rhs);bool operator>= (const string& lhs, const char*   rhs);

(1)

bool operator== (const string& lhs, const string& rhs) noexcept;bool operator== (const char*   lhs, const string& rhs);bool operator== (const string& lhs, const char*   rhs);

(2)

bool operator!= (const string& lhs, const string& rhs) noexcept;bool operator!= (const char*   lhs, const string& rhs);bool operator!= (const string& lhs, const char*   rhs);

(3)

bool operator<  (const string& lhs, const string& rhs) noexcept;bool operator<  (const char*   lhs, const string& rhs);bool operator<  (const string& lhs, const char*   rhs);

(4)

bool operator<= (const string& lhs, const string& rhs) noexcept;bool operator<= (const char*   lhs, const string& rhs);bool operator<= (const string& lhs, const char*   rhs);

(5)

bool operator>  (const string& lhs, const string& rhs) noexcept;bool operator>  (const char*   lhs, const string& rhs);bool operator>  (const string& lhs, const char*   rhs);

(6)

bool operator>= (const string& lhs, const string& rhs) noexcept;bool operator>= (const char*   lhs, const string& rhs);bool operator>= (const string& lhs, const char*   rhs);

Relational operators for string

Performs the appropriate comparison operation between the string objects lhs and rhs.

The functions use string::compare for the comparison.

These operators are overloaded in header <string>.

Parameters

lhs, rhs: Arguments to the left- and right-hand side of the operator, respectively.
If of type char*, it shall point to a null-terminated character sequence.

Example

// string comparisons
#include <iostream>
#include <vector>

int main ()
{
  std::string foo = "alpha";
  std::string bar = "beta";

  if (foo==bar) std::cout << "foo and bar are equal\n";
  if (foo!=bar) std::cout << "foo and bar are not equal\n";
  if (foo< bar) std::cout << "foo is less than bar\n";
  if (foo> bar) std::cout << "foo is greater than bar\n";
  if (foo<=bar) std::cout << "foo is less than or equal to bar\n";
  if (foo>=bar) std::cout << "foo is greater than or equal to bar\n";

  return 0;
}

Output:

foo and bar are not equal
foo is less than bar
foo is less than or equal to bar

Return Valuetrue if the condition holds, and false otherwise.

Complexity Unspecified, but generally up to linear in both lhs and rhs's lengths.

Iterator validity No changes.

Data races Both objects, lhs and rhs, are accessed.

Exception safety

If an argument of type

char*

does not point to null-terminated character sequence, it causes

undefined behavior

Otherwise, if an exception is thrown, there are no changes in the

string

(strong guarantee).

If an argument of type

char*

does not point to null-terminated character sequence, it causes

undefined behavior

For operations between

string

objects, exceptions are never thrown (no-throw guarantee).

For other cases, if an exception is thrown, there are no changes in the

string

(strong guarantee).