Aug 7, 2023 · Explore the memory layout of std::string in C++ with insights into implementations by MSVC, GCC, and LLVM. Understand key concepts like Small String Optimization (SSO), …

Every C++ developer knows that std::string represents a sequence of characters in memory. It manages its own memory, and is very intuitive to use. Today we’ll explore std::string as …

Dec 24, 2014 · A 24 byte string implementation is typical. If the length of the string is smaller than or equal to 16 bytes, instead of malloc'ing from the heap, it copies the string into the internal …

In the picture below we can see, first, how a string's layout is determined, and how the data is loaded into the registers. Here, the user-supplied string rests on the stack in the 24 byte span …

Jan 31, 2020 · Since each member is 8 bytes, sizeof(std::string) == 24. std::string uses the least significant bit of __cap_ to distinguish whether it is in long string mode or short string mode. If …

Mar 27, 2024 · The std::string payload is null-terminated (‘\0’). This seems to be useless, cause std::string stores the length, but it’s done to provide a null-terminated const char* via its …

Aug 3, 2023 · This sneaky trick lets clang shrink a std:: string down to 24 bytes on 64-bit systems, while still allowing 8-bit strings up to 22 characters and 16-bit strings up to 10 characters to be …

Nov 12, 2020 · However, that doesn't account for any dynamically allocated heap memory, which is how std::string stores its data internally. That 24 or 32 bytes is just the minimum size of a …

Oct 14, 2015 · The class template basic_string conforms to the requirements of a Sequence, as specified in (23.1.1). Additionally, because the iterators supported by basic_string are random …

Nov 7, 2024 · Understanding how memory management works with std::string is essential for writing efficient and bug-free code. In this blog post, we will delve into the intricacies of …