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Redefining NULL
I'm writing C code for a system where address 0x0000 is valid and contains port I/O. Therefore, any possible bugs that access a NULL pointer will remain undetected and at the same time cause dangerous behaviour.
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Change IPython/Jupyter notebook working directory
When I open a Jupyter notebook (formerly IPython) it defaults to C:\Users\USERNAME .
31 Answers
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Python: Tuples/dictionaries as keys, select, sort
Suppose I have quantities of fruits of different colors, e.g., 24 blue bananas, 12 green apples, 0 blue strawberries and so on.
I'd like to organize them in a data structure in Python that allows for easy selection and sorting. My idea was to put them into a dictionary with tuples as keys, e.g.,
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Capture characters from standard input without waiting for enter to be pressed
I can never remember how I do this because it comes up so infrequently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter).
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How should I escape strings in JSON?
When creating JSON data manually, how should I escape string fields? Should I use something like Apache Commons Lang's StringEscapeUtilities.escapeHtml , StringEscapeUtilities.escapeXml , or should I use java.net.URLEncoder ?
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Templated check for the existence of a class member function?
Is it possible to write a template that changes behavior depending on if a certain member function is defined on a class?
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How to turn on (literally) ALL of GCC's warnings?
I would like to enable -- literally -- ALL of the warnings that GCC has. (You'd think it would be easy...)
7 Answers
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C# 能否获取一个对象所占内存的大小？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
C# 能否获取一个对象所占内存的大小？今日，在项目重构的时候忽然想到一个问题，一个类哪些成员的增加，会影响一个类所占内存的大小？C#有没有办法知道一个对象占多少内存呢？ ...今日，在项目重构的时候忽然想到一个问...
比起创业孵化器 双创中国更急需的是创业教育 - 资讯 - 清泛网 - 专注C/C++...
...士的而非全民的，非业务因素掺杂得较少。正因如此，Facebook创始人、Airbnb创始人等硅谷创业领袖，都会抽出时间到行业人群中进行交流和分享。
而在中国，创业成功者不是行业偶像而是全民偶像，不再仅仅属于互联网科技行...
OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
OceanBase使用libeasy原理源码分析：客户端这篇主要写libeasy作为客户端的情形。结合OceanBase 0 4的mergeserver使用libeasy的情况进行分析,mergeserver请求chunkserver是异步请求，chunkserver使用update是同步请求，在li 这篇主要写libeasy作为客户...