How to Display And Return A List With Cmake?

In CMake, you can display and return a list by using the message command to print out the elements of the list. You can loop through the list using a foreach loop and print out each element individually. To return a list from a function, you can use the return command followed by the list variable. Make sure to properly format and separate the elements of the list for better readability.

What is the recommended approach for returning lists from functions in cmake?

The recommended approach for returning lists from functions in CMake is to use the set command to set a variable and then use PARENT_SCOPE to make the variable available in the parent scope. This way, the list can be accessed from the parent CMake script where the function was called.

For example:

1
2
3
4
5
6
7

function(get_numbers result)
    set(${result} 1 2 3 PARENT_SCOPE)
endfunction()

get_numbers(numbers)

message("List of numbers: ${numbers}")

In this example, the get_numbers function sets the variable numbers to contain the list 1 2 3. The PARENT_SCOPE flag allows the numbers variable to be accessed outside of the function in the parent scope.

What is the memory footprint of a list in cmake?

In CMake, a list does not have a specific memory footprint as it depends on the number of elements in the list and the size of the elements themselves. The memory footprint will increase with the size of the list and the amount of data stored in each element of the list.

How to initialize a list in cmake?

To initialize a list in CMake, you can use the set command. Here is an example of how to initialize a list in CMake:

1
2
3
4
5

set(my_list
    item1
    item2
    item3
)

In this example, the set command creates a list named my_list with three items: item1, item2, and item3. You can then use this list in your CMake scripts for various purposes.

How to check if an element exists in a list in cmake?

To check if an element exists in a list in CMake, you can use the LIST command along with the FIND subcommand. Here is an example of how to do this:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

# Define a list
set(my_list "apple" "banana" "orange")

# Check if the element "banana" exists in the list
list(FIND my_list "banana" index)

if(index EQUAL -1)
    message("Element doesn't exist in the list")
else()
    message("Element exists in the list at index ${index}")
endif()

In this example, we are checking if the element "banana" exists in the list my_list using the list(FIND) command. The index variable will store the index of the element if it exists in the list, or -1 if it does not exist.