Implement a K-th Element for the Set in C++
A set in C++ (aka std::set) is a ordered set (based on a Red-Black tree) while the unordered_set is based on a Hash Map. Implement a K-eth element for …
Category: c / c++
How to Modify or Patch the Compiled Executable (inplace, reverse engineering)?
I have a compiled .o file, and how to modify a string constant in it? for example, change “hello” to “HELLO”. Let’s take a look at this simple C …
How to PyArg_ParseTuple the bytearray in Python to C ?
How to PyArg_ParseTuple the bytearray in Python to C? For example, in Python, array = bytearray(bytes(random.choice(range(256)) * length)) and sometimes we want to pass this byte array to C …
Using CPU Intrinsics __builtin_ctz Function to Compute the Number of Trailing Zeros for a Integer (Binary)
Consider the following C/C++ function to count the number of trailing zeros for a integer (in binary form): static inline int count_trailing_zeros(int value) { int n = 0; while …
What is the CPU Intrinsics?
CPU intrinsics, also known as SIMD (Single Instruction, Multiple Data) intrinsics, are low-level programming instructions provided by modern CPUs to perform parallel computations on multiple data elements simultaneously. They …
