Can ORM ODB for C++ generate code from a database

I am fairly new to this library, and ORM in general. I know tools like EntityFramework can generate code from a database. Can ODB for C++ do this work? I don't think so. Looking at the main page of the project, there is an example how to use ODB. It seem that you need only add some pragmas here and there: #pragma db object class person { ... private: friend class odb::access; per

C ++的ORM ODB可以从数据库生成代码

我对这个图书馆以及一般的ORM相当陌生。 我知道像EntityFramework这样的工具可以从数据库中生成代码。 ODB可以用于C ++吗? 我不这么认为。 看一下项目的主页,有一个例子说明如何使用ODB。 看起来你只需要在这里和那里添加一些pragmas : #pragma db object class person { ... private: friend class odb::access; person () {} #pragma db id string email_; string name_; unsigned short age_; };

arm cortex a9 cross compiling strange floating point behaviour

I am trying to port a larger application from x86 to arm cortex a9, but I'm getting strange segmentation faults with floating point functions like modf when cross compiling the application, other libc++ functions just seem to handle floats wrong, but don't crash(see below). So I tried this small test programm, which can trigger the error too. The output of the test programm(see below)

手臂皮层a9交叉编译奇怪的浮点行为

我试图将一个更大的应用程序从x86移植到arm cortex a9上,但是当交叉编译应用程序时,我遇到了像modf这样的浮点函数的奇怪分段错误,其他的libc ++函数似乎只处理浮动错误,但不会崩溃(见下文)。 所以我尝试了这个小测试程序,这可能会引发错误。 测试程序的输出(见下文)应该证明我的问题。 #include <iostream> int main(int argc, char *argv[]) { double x = 80; double y = 0; std::cout <<

Specific Template Friendship in C++

I have a question for Specific Template Friendship in C++. in the book C++ Primer, the specific template friendship is written like this: template <class T> class Foo3; template <class T> void templ_fcn3(const T&); template <class Type> class Bar { // each instantiation of Bar grants access to the // version of Foo3 or templ_fcn3 instantiated with the same typ

C ++中的具体模板友谊

我对C ++中的特定模板友谊有疑问。 在C ++ Primer一书中,具体的模板友谊就是这样写的: template <class T> class Foo3; template <class T> void templ_fcn3(const T&); template <class Type> class Bar { // each instantiation of Bar grants access to the // version of Foo3 or templ_fcn3 instantiated with the same type friend class Foo3<Type>; friend void

Creating shared and static libraries using g++ (under Windows)

How do I create static and dynamic libraries for Windows using g++? I've found a few commands for Linux for creating .so files and I've tried to apply them on a Windows shell, but they build .dll files that my applications fail to link with at runtime. I've only managed to build .dll files using Visual C++ but I would like to build them manually on the command line, preferably usi

使用g ++创建共享和静态库(在Windows下)

如何使用g ++为Windows创建静态和动态库? 我发现了一些用于创建.so文件的Linux命令,并且我试图将它们应用到Windows外壳程序,但它们会生成应用程序在运行时无法链接的.dll文件。 我只设法使用Visual C ++构建.dll文件,但我想在命令行上手动构建它们,最好使用g++ 。 我也想知道如何为Windows构建静态库。 您需要使用属性的前缀: __declspec(dllexport)... 您想要公开的所有功能。 看到这个。 C函数的示例: __d

Is It possible to Linking static library into dynamic library in Visual Studio?

I am try to link a static library in a dynamic library tmxParser.lib in Visual Studio 2010 express. I have the static library set as a dependency of the dynamic library. When VS build the static library builds fine and creates tmxParser.lib. When VS builds the dynamic library I am getting linker errors. I tried to match the Runtime Library under property page -> Configuration properties -&

是否有可能将静态库链接到Visual Studio中的动态库?

我尝试在Visual Studio 2010 express中的动态库tmxParser.lib中链接一个静态库。 我将静态库设置为动态库的依赖关系。 当VS构建静态库时建立良好并创建tmxParser.lib。 当VS构建动态库时,我收到链接器错误。 我试图匹配属性页下的运行时库 - >配置属性 - > C / C ++ - >代码生成它没有帮助。 任何人有任何想法? 2>LIBCMTD.lib(fopen.obj) : error LNK2005: _fopen already defined in s3e_d.lib(iwcrt_stdio

building static library (.lib) VS 2010 Pro

I have a newbie question about building a static library in VS 2010 Pro. When you choose to build a static library (.lib) instead of an application, the Linker option in project properties disappears. Normally I go to Linker->Input->Additional Dependencies to add the needed .lib files for a project. I've built the library and added it to my main application project under Linker->

构建静态库(.lib)VS 2010 Pro

我有一个关于在VS 2010 Pro中构建静态库的新手问题。 当您选择构建静态库(.lib)而不是应用程序时,项目属性中的链接程序选项将消失。 通常我会转到Linker-> Input-> Additional Dependencies来为项目添加所需的.lib文件。 我已经构建了该库并将其添加到链接器 - >输入 - >其他依赖项下的我的主应用程序项目中。 现在,当我开始构建我的主应用程序(包含在项目.lib文件中的上述静态库)时,我收到了有关库中

Creating custom voice commands (GNU/Linux)

I'm looking for advices, for a personal project. I'm attempting to create a software for creating customized voice commands. The goal is to allow user/me to record some audio data (2/3 secs) for defining commands/macros. Then, when the user will speak (record the same audio data), the command/macro will be executed. The software must be able to detect a command in less than 1 second

创建自定义语音命令(GNU / Linux)

我正在寻找建议,为一个个人项目。 我正在尝试创建一个用于创建自定义语音命令的软件。 目标是允许用户/我记录一些音频数据(2/3秒)来定义命令/宏。 然后,当用户说话(记录相同的音频数据)时,命令/宏将被执行。 该软件必须能够在低成本计算机中以小于1秒的处理时间检测命令(例如RaspberryPi)。 我已经通过两种方式进行了搜索: - 语音识别(CMU-Sphinx,Julius,simon):有很好的开源解决方案,但他们经常需要大型

How to prevent delete px.get() for a unique

On the boost.org website, I saw an example of preventing delete px.get() for a shared_ptr (http://www.boost.org/doc/libs/1_51_0/libs/smart_ptr/sp_techniques.html#preventing_delete). This is a good technique and I would like to apply this using std::unique_ptr in C++11, and after tooling around for a bit, I can't quite get their example working with std::unique_ptr. Is it possible to preve

如何防止删除px.get()的唯一

在boost.org网站上,我看到一个防止删除px.get()为shared_ptr(http://www.boost.org/doc/libs/1_51_0/libs/smart_ptr/sp_techniques.html#preventing_delete)的例子。 这是一个很好的技术,我想在C ++ 11中使用std :: unique_ptr,并且在使用了一些工具之后,我无法完全使用std :: unique_ptr来获得它们的示例。 是否有可能阻止在std :: unique_ptr上调用delete px.get()? 以下是来自boost.org网站的代码,显示如何

Error in including header file in .h file but not in .cpp

With Visual Studio 2013 I'm writing a Dynamic Library and I need to use some third-party libraries. Each library comes in the form of header .h, a .dll and .lib files. I added the library's directory to my project, I changed the "Configuration Properties -> C/C++ -> Additional Include Directories" to include the header file and I added the .lib file to the Additional Dep

将头文件包含在.h文件中但不包含在.cpp文件中时出错

使用Visual Studio 2013我正在编写动态库,我需要使用一些第三方库。 每个库都以标头.h,.dll和.lib文件的形式出现。 我将库的目录添加到我的项目中,我更改了“配置属性 - > C / C ++ - >其他包含目录”以包含头文件,并将.lib文件添加到链接程序的其他依赖项。 如果我尝试在我的.cpp文件中使用头文件.h #include "library.h" 一切工作正常,编译器没有错误。 但是,如果我把这行放在我的头文件.h文件中,并尝

C++ How to include class headers without having to compile their cpp files?

We can include < iostream > and we do not care about its cpp file, but why can't we do the same for our own classes ? So if my project uses 50 custom classes, not only do I have to have 50 includes, but also have to compile/link 50 cpp files along with them (and clutter the project tree). Q: Is there any way to use custom headers the same way we use standard libraries ? In other w

C ++如何包含类头文件而不必编译它们的cpp文件?

我们可以包含<iostream>,我们不关心它的cpp文件,但为什么我们不能为我们自己的类做同样的事情? 因此,如果我的项目使用50个自定义类,则不仅必须包含50个自定义类,还必须编译/链接50个cpp文件(以及混乱项目树)。 问:是否有任何方法使用自定义标题,就像我们使用标准库一样? 换句话说,是否有一种犹太教的方式,以便我们不必在项目中添加所有这些cpp文件。 我只想包括ClassSnake.hpp,它反过来知道在哪里可