conditional

automake Environment Variable Condition

由 半腔热情 提交于 2020-01-23 13:33:45
问题 I have a file Makefile.am I am using to generate a Makefile. In the generated Makefile I want to have something like: ifndef SOURCECODEPATH SOURCECODEPATH := /home/root/source_code_path endif It seems so simple, does anyone know how I can do it? 回答1: Use the AM_CONDITIONAL macro in configure.ac . The script sets a variable you can test, e.g., a variable that is set to non-empty if the condition is enabled: AM_CONDITIONAL([ENABLE_SOURCECODEPATH], [test "x$ac_srcpath" != "x"]) Then in Makefile

C++, ternary operator, std::cout

由 纵饮孤独 提交于 2020-01-23 04:52:11
问题 How to write the following condition with a ternary operator using C++ int condition1, condition2, condition3; int / double result; //int or double .... std::cout << ( condition1: result1 : "Error" ) << ( condition2: result2 : "Error" ) << ( condition3: result3 : "Error")...; 回答1: Depends on what type is result1, result2 etc. expressionC ? expression1 : expression2 isn't valid for all types of expression1 and expression2 . They must necessarily be convertible to a common type, roughly

Cython conditional compile based on external value

由 冷暖自知 提交于 2020-01-22 16:28:50
问题 I try to conditionally compile (or generate) to c code from a Cython pxd. I read that I can DEF to define aa value and IF to conditionally generate based on its value, but how can I get this value to get from outside of the pxd file? Specifically these two cases are interesting for me now: give some command-line define to Cython, preferrably through the Cython.Distutils setuptools way the extern-ed C header file defines some value, and conditionally define using Cython based on this value

PHP/HTML/CSS - If FireFox, If Chrome, If Safari

由 天涯浪子 提交于 2020-01-22 07:36:51
问题 Is there a simple conditional statement, css command, html, jquery, javascript or simple PHP dynamic way of detecting the current browser? <!if firefox> .element { top:4px; } <![endif]> <!if chrome> .element { top:6px; } <![endif]> <!if ie> .element { top:8px; } <![endif]> <!if opera> .element { top:10px; } <![endif]> <!if safari_webkit> .element { top:12px; } <![endif]> Can this Psuedo code be done in jQuery/JS/HTML or CSS PHP etc? 回答1: With CSS there is no way you can achieve browser

unity行为树简介

由 做~自己de王妃 提交于 2020-01-22 03:35:29
目前在Unity3D游戏中一般复杂的AI都可以看到行为树的身影，简单的AI使用状态机来实现就可以了，所以这里我也是简单的学习下，为以后用到做准备。 行为树的概念出现已经很多年了，总的来说，就是使用各种经典的控制节点+行为节点进行组合，从而实现复杂的AI。 Behavior Designer插件里，主要有四种概念节点，都称之为Task。包括： (1) Composites 组合节点，包括经典的：Sequence，Selector，Parallel (2) Decorator 装饰节点，顾名思义，就是为仅有的一个子节点额外添加一些功能，比如让子task一直运行直到其返回某个运行状态值，或者将task的返回值取反等等 (3) Actions 行为节点，行为节点是真正做事的节点，其为叶节点。Behavior Designer插件中自带了不少Action节点，如果不够用，也可以编写自己的Action。一般来说都要编写自己的Action，除非用户是一个不懂脚本的美术或者策划，只想简单地控制一些物件的属性。 (4) Conditinals 条件节点 ，用于判断某条件是否成立。目前看来，是Behavior Designer为了贯彻职责单一的原则，将判断专门作为一个节点独立处理，比如判断某目标是否在视野内，其实在攻击的Action里面也可以写，但是这样Action就不单一了，不利于视野判断处理的复用

Count items by condition with XML and PHP?

由 夙愿已清 提交于 2020-01-21 20:11:50
问题 I would like to get the count of only items inside this file with sellingstatus->sellingstate of EndedWithSales ONLY, and perhaps also get the count for EnededWithoutSales . <sellingStatus> <currentPrice currencyId="USD">25.0</currentPrice> <convertedCurrentPrice currencyId="USD">25.0</convertedCurrentPrice> <bidCount>1</bidCount> <sellingState>EndedWithSales</sellingState> </sellingStatus> How would I go about passing this argument in php? Here is a link to the sample of XML: http:/

Count items by condition with XML and PHP?

由 匆匆过客 提交于 2020-01-21 20:11:31
问题 I would like to get the count of only items inside this file with sellingstatus->sellingstate of EndedWithSales ONLY, and perhaps also get the count for EnededWithoutSales . <sellingStatus> <currentPrice currencyId="USD">25.0</currentPrice> <convertedCurrentPrice currencyId="USD">25.0</convertedCurrentPrice> <bidCount>1</bidCount> <sellingState>EndedWithSales</sellingState> </sellingStatus> How would I go about passing this argument in php? Here is a link to the sample of XML: http:/

Count items by condition with XML and PHP?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-01-21 20:11:05
问题 I would like to get the count of only items inside this file with sellingstatus->sellingstate of EndedWithSales ONLY, and perhaps also get the count for EnededWithoutSales . <sellingStatus> <currentPrice currencyId="USD">25.0</currentPrice> <convertedCurrentPrice currencyId="USD">25.0</convertedCurrentPrice> <bidCount>1</bidCount> <sellingState>EndedWithSales</sellingState> </sellingStatus> How would I go about passing this argument in php? Here is a link to the sample of XML: http:/

Ternary operator with multiple conditions

由 自古美人都是妖i 提交于 2020-01-17 05:47:29
问题 Hello I am trying to properly format ternary operator to be using multiple conditions in php: $result = ($var !== 1 || $var !== 2) ? '' : 'default'; The problem is that in this format I always get not true even iv the $var is 1 or 2. With one condition for example $var == 0 it is working fine. Any help will be welcome. 回答1: This statement will always be true : ($var !== 1 || $var !== 2) Because $var can never simultaneously be both values, it will always not be at least one of the two values.

How can I use 'do I have root access?' as a conditional in bash?

由 感情迁移 提交于 2020-01-17 03:59:30
问题 I am writing an installation script, and would like it to install in a local directory if the user does not have root access. specifically, I am looking for the code that goes between the carats ( <> ) if [[<do I have root access? = TRUE>]]; then .. install .. else .. install in $HOME/mylib .. fi 回答1: For bash, you can use the EUID variable: if [ "$EUID" == 0 ] ; then ..something.. else ..something else fi For a POSIX-compliant solution, use: if [ "`id -u`" == 0 ] ; then Although be aware
订阅 conditional