1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
# returns true if only a single one of its arguments is true
function(xor result)
set(true_args_count 0)
foreach(foo ${ARGN})
if(foo)
math(EXPR true_args_count "${true_args_count}+1")
endif()
endforeach()
if(NOT (${true_args_count} EQUAL 1))
set(${result} FALSE PARENT_SCOPE)
else()
set(${result} TRUE PARENT_SCOPE)
endif()
endfunction()
function(at_most_one result)
set(true_args_count 0)
foreach(foo ${ARGN})
if(foo)
math(EXPR true_args_count "${true_args_count}+1")
endif()
endforeach()
if(${true_args_count} GREATER 1)
set(${result} FALSE PARENT_SCOPE)
else()
set(${result} TRUE PARENT_SCOPE)
endif()
endfunction()
|
