These C functions mirror Scheme's equality predicate procedures with one
important difference. The C routines return C boolean values (0 and 1)
instead of `SCM_BOOL_T`

and `SCM_BOOL_F`

.

The Scheme notational convention of putting a `?`

at the end of
predicate procedure names is mirrored in C by placing `_p`

at the
end of the procedure. For example, `(equal? ...)`

maps to
`gh_equal_p(...)`

.

__Function:__int**gh_eq_p***(SCM x, SCM y)*-
Returns 1 if
`x`and`y`are equal in the sense of Scheme's`eq?`

predicate, 0 otherwise.

__Function:__int**gh_eqv_p***(SCM x, SCM y)*-
Returns 1 if
`x`and`y`are equal in the sense of Scheme's`eqv?`

predicate, 0 otherwise.

__Function:__int**gh_equal_p***(SCM x, SCM y)*-
Returns 1 if
`x`and`y`are equal in the sense of Scheme's`equal?`

predicate, 0 otherwise.

__Function:__int**gh_string_equal_p***(SCM*`s1`, SCM`s2`)-
Returns 1 if the strings
`s1`and`s2`are equal, 0 otherwise.

__Function:__int**gh_null_p***(SCM*`l`)-
Returns 1 if
`l`is an empty list or pair; 0 otherwise.

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