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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
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BLE技术揭秘
BLE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨...
Difference between null and empty (“”) Java String
...not, 20 is a number). Same case for null: it's not a string, but it can be converted to one if you try to add it.
– daboross
Mar 4 '18 at 9:13
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Best way to create an empty object in JSON with PHP?
... the method to use.
PHP: Objects - Manual
If a value of any other type is converted to an object, a new instance of the stdClass built-in class is created. If the value was NULL, the new instance will be empty.
.. but, try to keep it safe!
Though you never know when/if the above will change, so i...
Set breakpoint in C or C++ code programmatically for gdb on Linux
... I don't know other debuggers, but gdb is pretty flexible about signal handling.
– Cascabel
Dec 1 '10 at 16:25
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When to use static vs instantiated classes
...n it's just a tool that works on other stuff (like, for instance, a syntax converter for BB code to HTML ; it doesn't have a life on its own)
(Yeah, I admit, really really overly-simplified...)
One thing about static methods/classes is that they don't facilitate unit testing (at least in PHP, but...
When is assembly faster than C?
...actually be used to generate more performant code are both extremely rare and require expert knowledge of and experience with assembly.
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What is the best way to find the users home directory in Java?
... looking for a snippet of code that can accomplish this for all platforms, and a way to detect the platform.
9 Answers
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Why unsigned integer is not available in PostgreSQL?
...post ( What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL? ) and realized that PostgreSQL does not support unsigned integer.
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ruby 1.9: invalid byte sequence in UTF-8
...-op, and no checks are run. Ruby Core Documentation for encode. However, converting it to UTF-16 first forces all the checks for invalid byte sequences to be run, and replacements are done as needed.
– Jo Hund
Aug 11 '13 at 18:32
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Why should I not include cpp files and instead use a header?
So I finished my first C++ programming assignment and received my grade. But according to the grading, I lost marks for including cpp files instead of compiling and linking them . I'm not too clear on what that means.
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