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Higher-order functions: Difference between revisions
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</lang>
=={{header|Order}}==
Functions in Order can accept any other named function, local variable, or anonymous function as arguments:
<lang C>
#include <order/interpreter.h>
#define ORDER_PP_DEF_8func1 ORDER_PP_FN ( \
8fn(8F, \
8ap(8F, 8("a string")) ))
#define ORDER_PP_DEF_8func2 ORDER_PP_FN ( \
8fn(8S, \
8adjoin(8("func2 called with "), 8S ) ))
ORDER_PP(
8func1(8func2)
)
// -> "func2 called with ""a string"
#define ORDER_PP_DEF_8func3 ORDER_PP_FN ( \
8fn(8F, \
8ap(8F, 1, 2) ))
ORDER_PP(
8func3(8plus)
)
// -> 3
ORDER_PP(
8ap( 8fn(8X, 8Y, 8mul(8add(8X, 8Y), 8sub(8X, 8Y))), 5, 3)
)
// -> 16
</lang>
The only difference between toplevel function definitions, and variables or literals, is that variables and anonymous functions must be called using the <code>8ap</code> syntactic form rather than direct argument application syntax. This is a limitation of the C preprocessor.
=={{header|OxygenBasic}}==
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