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Diffstat (limited to 'doc/gawk.info')
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1 files changed, 303 insertions, 297 deletions
diff --git a/doc/gawk.info b/doc/gawk.info index 1e6e93f5..f008ecfa 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -13853,7 +13853,7 @@ File: gawk.info, Node: Indirect Calls, Next: Functions Summary, Prev: User-de 9.3 Indirect Function Calls =========================== -This section describes a `gawk'-specific extension. +This section describes an advanced, `gawk'-specific extension. Often, you may wish to defer the choice of function to call until runtime. For example, you may have different kinds of records, each of @@ -13892,7 +13892,7 @@ your test scores: This style of programming works, but can be awkward. With "indirect" function calls, you tell `gawk' to use the _value_ of a variable as the -name of the function to call. +_name_ of the function to call. The syntax is similar to that of a regular function call: an identifier immediately followed by a left parenthesis, any arguments, @@ -13934,7 +13934,6 @@ using indirect function calls. Otherwise they perform the expected computations and are not unusual. # For each record, print the class name and the requested statistics - { class_name = $1 gsub(/_/, " ", class_name) # Replace _ with spaces @@ -14121,11 +14120,11 @@ names of the two comparison functions: Remember that you must supply a leading `@' in front of an indirect function call. - Unfortunately, indirect function calls cannot be used with the -built-in functions. However, you can generally write "wrapper" -functions which call the built-in ones, and those can be called -indirectly. (Other than, perhaps, the mathematical functions, there is -not a lot of reason to try to call the built-in functions indirectly.) + Starting with version 4.1.2 of `gawk', indirect function calls may +also be used with built-in functions and with extension functions +(*note Dynamic Extensions::). The only thing you cannot do is pass a +regular expression constant to a built-in function through an indirect +function call.(1) `gawk' does its best to make indirect function calls efficient. For example, in the following case: @@ -14133,7 +14132,12 @@ example, in the following case: for (i = 1; i <= n; i++) @the_func() -`gawk' will look up the actual function to call only once. +`gawk' looks up the actual function to call only once. + + ---------- Footnotes ---------- + + (1) This may change in a future version; recheck the documentation +that comes with your version of `gawk' to see if it has. File: gawk.info, Node: Functions Summary, Prev: Indirect Calls, Up: Functions @@ -14170,7 +14174,9 @@ File: gawk.info, Node: Functions Summary, Prev: Indirect Calls, Up: Functions * User-defined functions may call other user-defined (and built-in) functions and may call themselves recursively. Function parameters - "hide" any global variables of the same names. + "hide" any global variables of the same names. You cannot use the + name of a reserved variable (such as `ARGC') as the name of a + parameter in user-defined functions. * Scalar values are passed to user-defined functions by value. Array parameters are passed by reference; any changes made by the @@ -14186,10 +14192,9 @@ File: gawk.info, Node: Functions Summary, Prev: Indirect Calls, Up: Functions either scalar or array. * `gawk' provides indirect function calls using a special syntax. - By setting a variable to the name of a user-defined function, you - can determine at runtime what function will be called at that - point in the program. This is equivalent to function pointers in C - and C++. + By setting a variable to the name of a function, you can determine + at runtime what function will be called at that point in the + program. This is equivalent to function pointers in C and C++. @@ -34292,288 +34297,289 @@ Node: Pass By Value/Reference571978 Node: Return Statement575488 Node: Dynamic Typing578472 Node: Indirect Calls579401 -Node: Functions Summary589114 -Node: Library Functions591653 -Ref: Library Functions-Footnote-1595271 -Ref: Library Functions-Footnote-2595414 -Node: Library Names595585 -Ref: Library Names-Footnote-1599058 -Ref: Library Names-Footnote-2599278 -Node: General Functions599364 -Node: Strtonum Function600392 -Node: Assert Function603266 -Node: Round Function606592 -Node: Cliff Random Function608133 -Node: Ordinal Functions609149 -Ref: Ordinal Functions-Footnote-1612214 -Ref: Ordinal Functions-Footnote-2612466 -Node: Join Function612677 -Ref: Join Function-Footnote-1614448 -Node: Getlocaltime Function614648 -Node: Readfile Function618384 -Node: Data File Management620223 -Node: Filetrans Function620855 -Node: Rewind Function624924 -Node: File Checking626482 -Ref: File 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