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extern const struct x1f4_function_type *const x1f4_e4_computables;

x1f4_e4_computables points to an array of always computable functions. The array is null terminated (the last struct x1f4_function_type definition in the array has its name field set as NULL).

x1f4_e4_computables points into x1f4_e4_defaults and excludes functions that depending their arguments may fail to evaluate (such as log and sqrt that are defined for positive input only).

See x1f4_e4_defaults.