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Compiling C++11 with g++

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问题 I'm trying to update my C++ compiler to C++11. I have searched a bit and I have come to the conclusion that I have to use the flag -std=c++0x or -std=gnu++0x , but I don't know many things about flags. Can anyone help me? (I'm using Ubuntu 12.04.) Here is the error that I get from the compiler when I attempt to use a library which is included in C++11 (i.e. array): #include <array> #include <iostream> int main() { std::array<int, 3> arr = {2, 3, 5}; ... } This file requires compiler and

Compiling C++11 with g++

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Compiling C++11 with g++

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c++运算符优先级表

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优先级操作符描述例子结合性 1 () [] -> . :: ++ -- 调节优先级的括号操作符数组下标访问操作符通过指向对象的指针访问成员的操作符通过对象本身访问成员的操作符作用域操作符后置自增操作符后置自减操作符 (a + b) / 4; array[4] = 2; ptr->age = 34; obj.age = 34; Class::age = 2; for( i = 0; i < 10; i++ ) ... for( i = 10; i > 0; i-- ) ... 从左到右 2 ! ~ ++ -- - + * & (type) sizeof 逻辑取反操作符按位取反(按位取补) 前置自增操作符前置自减操作符一元取负操作符一元取正操作符解引用操作符取地址操作符类型转换操作符返回对象占用的字节数操作符 if( !done ) ... flags = ~flags; for( i = 0; i < 10; ++i ) ... for( i = 10; i > 0; --i ) ... int i = -1; int i = +1; data = *ptr; address = &obj; int i = (int) floatNum; int size = sizeof(floatNum); 从右到左 3 ->* .*

How can I read hexadecimal data with python?

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问题 I have this c# app that Im trying to cooperate with a app written in python. The c# app send simple commands to the python app, for instance my c# app is sending the following: [Flags] public enum GameRobotCommands { reset = 0x0, turncenter = 0x1, turnright = 0x2, turnleft = 0x4, standstill = 0x8, moveforward = 0x10, movebackward = 0x20, utility1 = 0x40, utility2 = 0x80 } I'm doing this over TCP and got the TCP up and running, but can I plainly do this in Python to check flags: if (self.data

How to allow -z multidefs with g++47

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问题 How can I tell the linker of g++ to allow multiple definitions of symbols (choose the first appearance)? -z multidefs Allows multiple symbol definitions. By default, multiple symbol definitions occurring between relocatable objects (.o files) will result in a fatal error condition. This option suppresses the error condition and allows the first symbol definition to be taken. This option is valid only when the -b svr4 option is specified. The -zmuldefs option is not recognized by g++ , nor -z

MySQL problem with statement

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问题 SELECT a.id,i.* FROM ads a INNER JOIN images i ON i.ad_id=a.id GROUP BY a.id LIMIT 10 Can't figure out, how to pick images with flag "main" inside images table. For one a.id can be up to 3 photos inside images table, one of those 3 photos can have a field main=1. I need to pick photos by priority where flag main is set to 1. CREATE DATABASE IF NOT EXISTS `test123`; USE `test123`; CREATE TABLE IF NOT EXISTS `ads` ( `id` int(10) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO

Unable to use flags in OpenCV Python?

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问题 I'm unable to use flags in OpenCV. For example: import cv2 image = cv2.imread('k.jpg',cv2.CV_LOAD_IMAGE_GRAYSCALE) cv2.namedWindow('Pic',cv2.CV_WINDOW_NORMAL) cv2.imshow('Pic', image) cv2.waitKey() In this program I'm able to use cv2.CV_LOAD_IMAGE_GRAYSCALE but I'm not able to use flags for namedWindow here. This one gives error: module has no attribute CV_WINDOW_NORMAL 回答1: Just a short update: Since OpenCV 3.0, these are cv2.IMREAD_GRAYSCALE and cv2.WINDOW_NORMAL (use help(cv2) for the

Relaunching my app from same state gets failed, Oops :(

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问题 What I am trying to say here is the problem I'm facing to relaunch my app from same state where it was left before. I have did lot of R&D on this and have gone through the questions posted in stackoverflow.So please it is not necessary to say that it is a duplicate. I tried putting these options objIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP); while starting the activity. Also I have tried this, objIntent.addFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

Intent.FLAG_ACTIVITY_FORWARD_RESULT and PendingIntent

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问题 I want to receive an Intent instance from an Activity launched by an AlarmManager with a pendingIntent. I have the Activity A launch the Activity B through alarmManager with pendingIntent like this : PendingIntent pendingIntent = PendingIntent.getActivity(this, position, intentListAlarmActivityToWakeUpActivity, 0); Log.i("position", position +""); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.set(Calendar.HOUR_OF_DAY, hourAlarm);