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module submodule_16_string
implicit none
type :: string_t
character(len=:), allocatable :: s
end type
interface operator(//)
module procedure cat_char_string
end interface
contains
pure function cat_char_string(lhs, rhs) result(out)
character(len=*), intent(in) :: lhs
type(string_t), intent(in) :: rhs
character(len=:), allocatable :: out
out = lhs // rhs%s
end function
end module
module submodule_16_m
use submodule_16_string, only: string_t, operator(//)
implicit none
type :: test_diagnosis_t
logical :: test_passed_ = .false.
character(len=:), allocatable :: diagnostics_string_
end type
interface operator(//)
elemental module function append_string_if_test_failed(lhs, rhs) result(lhs_cat_rhs)
class(test_diagnosis_t), intent(in) :: lhs
type(string_t), intent(in) :: rhs
type(test_diagnosis_t) lhs_cat_rhs
end function
end interface
contains
subroutine run_demo()
type(test_diagnosis_t) :: d
type(string_t) :: s
d%test_passed_ = .false.
d%diagnostics_string_ = "prefix: "
s%s = "payload"
d = d // s
if (d%diagnostics_string_ /= "prefix: payload") error stop 1
end subroutine
end module
submodule(submodule_16_m) submodule_16_s
implicit none
contains
module procedure append_string_if_test_failed
if (lhs%test_passed_) then
lhs_cat_rhs = lhs
else
lhs_cat_rhs = test_diagnosis_t(lhs%test_passed_, lhs%diagnostics_string_ // rhs)
end if
end procedure
end submodule
program submodule_16
use submodule_16_m, only: run_demo
implicit none
call run_demo()
end program
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