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I would like to create a CMake function as:
function(test src_list dst_list) # do something endfunction() usage:
test(${my_list} chg_list) It means, my_list is a list with several fields, and chg_list will receive a list modified inside test function.
How can I create a function in CMake to do that?
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The out parameter in C# is used to pass arguments to methods by reference. It differs from the ref keyword in that it does not require parameter variables to be initialized before they are passed to a method. The out keyword must be explicitly declared in the method's definition as well as in the calling method.
An out-parameter represents information that is passed from the function back to its caller. The function accomplishes that by storing a value into that parameter. Use call by reference or call by pointer for an out-parameter. For example, the following function has two in-parameters and two out-parameters.
The out is a keyword in C# which is used for the passing the arguments to methods as a reference type. It is generally used when a method returns multiple values.
In CMake, functions have their own scope, and by default, all modification of variables are local, unless you pass CACHE or PARENT_SCOPE as parameter to set. Inside a function, if you want to modify a variable in the scope of the caller, you should use:
set(${dst_list} <something> PARENT_SCOPE) See documentation:
A function opens a new scope: see set(var PARENT_SCOPE) for details.
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