Common C++ classes and routines used by my applications such as argument parser, IO and conversion utilities
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if(NOT DEFINED LIST_TO_STRING_LOADED)
function(list_to_string separator prefix suffix input_list output_string_var)
set(res "")
# get list length
list(LENGTH input_list list_length)
# if the list has 0 or 1 element, there is no need to loop over
if(list_length LESS 2)
set(res "${prefix}${input_list}${suffix}")
else()
math(EXPR last_element_index "${list_length} - 1")
foreach(index RANGE ${last_element_index})
# get current item_value
list(GET input_list ${index} item_value)
if(NOT item_value STREQUAL "")
# .. and append non-empty value to output string
set(res "${res}${prefix}${item_value}${suffix}")
# append separator if current element is NOT the last one.
if(NOT index EQUAL last_element_index)
set(res "${res}${separator}")
endif()
endif()
endforeach()
endif()
set(${output_string_var} "${res}" PARENT_SCOPE)
endfunction()
set(LIST_TO_STRING_LOADED YES)
endif()