1 前言 XS是Perl与C的胶水语言,通过它能在Perl中创建方法,以此扩展C库中的函数或新定义的C函数,详情可参阅《官方手册:perlxs》。 XS的编译器叫做xsubpp,它用typemaps去决定如何映射C函数的参量和输出值到Perl的值中并返回。“XSUB结构(XSUB forms)”是XS接口的基本单元,一个XSUB被编译后等效于一个C函数,其...
prints a string to the console. Here is an example @numbers= (1, 2, 3,4,5,6);my$searchElement=1;for(@numbers) {if($_eq$searchElement) {print"exists";last;}} #Use smart match Operator The smart match operator is an experimental feature and is introduced in the Perl 5.10 version....
Strawberry Perlis a perl environment for MS Windows containing all you need to run and develop perl applications. It is designed to be as close as possible to perl environment on UNIX systems. It includes perl binaries, compiler (gcc) + related tools, all the external libraries (crypto, math...
A string in two parts, separated by a "\0" byte, the first part describes the input layers, the second part describes the output layers. $PERLDB $^P The internal variable for debugging support. The meanings of the various bits are subject to change, but currently indicate: 0x01 Debug ...
var version string rows.Scan(&version) fmt.Println(version) } } 从上面代码可以看到,我们需要首先导入 database/sql 和 lib/pq 两个包。 import ("database/sql""fmt"_ "github.com/lib/pq""log")注意这里在导入 lib/pq 时,前面加了下划线(_),因为通常来说,不直接使用驱动所提供的方法,而是应该使用...
file location; # check if file exist, if not create. # running running 'process matching part'; # check the existence of running processes through the specified command-line string pattern. if no processes match the pattern, make the current rule fail immediately. ...
print "Content-type: text/plain\n\n"; print "A week ago the date was ",date_a_week_ago( ),"\n"; # return a date one week ago as a string in format: MM/DD/YYYY sub date_a_week_ago { my @month_len = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); my(...
It tried to set the LC_ALL locale to the empty string and that returned NULL... And a return of NULL from setlocale means it failed... Now a simply test program: #include <stdio.h> #include <locale.h> int main(void) { char * foo; foo = setlocale(LC_ALL, ""); printf("LC_...
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Now I can see the part of the string that matched as well as the submatches: % perldoc -t perl | perl-grep4.pl "\b(\S)\S\1\b" perl587delta Perl changes in version 5.8.7 $&: .8. $1: . If I change my pattern to have more submatches, I don’t have to change anything ...