Add pure label for all_close.

Author: zoziha

doc/specs/stdlib_math.md

@@ -468,7 +468,7 @@ Experimental.
 
 #### Class
 
-Impure function.
+Pure function.
 
 #### Arguments
 

src/stdlib_math.fypp

@@ -313,7 +313,7 @@ module stdlib_math
         #:set RANKS = range(1, MAXRANK + 1)
         #:for k1, t1 in RC_KINDS_TYPES
         #:for r1 in RANKS
-        logical module function all_close_${r1}$_${t1[0]}$${k1}$(a, b, rel_tol, abs_tol) result(close)
+        logical pure module function all_close_${r1}$_${t1[0]}$${k1}$(a, b, rel_tol, abs_tol) result(close)
             ${t1}$, intent(in) :: a${ranksuffix(r1)}$, b${ranksuffix(r1)}$
             real(${k1}$), intent(in), optional :: rel_tol, abs_tol
         end function all_close_${r1}$_${t1[0]}$${k1}$

src/stdlib_math_all_close.fypp

@@ -10,7 +10,7 @@ contains
 
     #:for k1, t1 in RC_KINDS_TYPES
     #:for r1 in RANKS
-    logical module function all_close_${r1}$_${t1[0]}$${k1}$(a, b, rel_tol, abs_tol) result(close)
+    logical pure module function all_close_${r1}$_${t1[0]}$${k1}$(a, b, rel_tol, abs_tol) result(close)
 
         ${t1}$, intent(in) :: a${ranksuffix(r1)}$, b${ranksuffix(r1)}$
         real(${k1}$), intent(in), optional :: rel_tol, abs_tol