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

public static member function

std::char_traits::assign character (1)

static void       assign (char_type& r, const char_type& c);

array (2)

static char_type* assign (char_type* p, size_t n, char_type c);

character (1)

static void       assign (char_type& r, const char_type& c) noexcept;

array (2)

static char_type* assign (char_type* p, site_t n, char_type c);

Assign character

Assigns c to a character (r) or to an array of characters (s).

(1) character: Assigns c to r, as if using r=c.
(2) array: Assigns c to the first n characters in the array pointed by s, each as if using operator=.

In the standard specializations of

char_traits

, this function behaves as the built-in

operator=

, but custom

character traits

classes may provide an alternative behavior whenever this is consistent with the assignment operation of its character type.

Parameters

r: An lvalue reference to character.
c: A character value.
p: A pointer to the array where the characters will be written.
n: Number of characters to fill with a value of c.

Member type char_type is the character type (i.e., the class template parameter in char_traits).
size_t is an unsigned integral type.

Return Value none (for (1)).
p (for (2)).

Complexity Constant.

Exception safety Unless s does not point to an array long enough, this member function never throws exceptions (no-throw guarantee) in any of the standard specializations.
Otherwise, it causes undefined behavior.

See also

char_traits::eq: Compare characters for equality (public static member function)

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