Stefano Cristiano
@pagghiu.bsky.social
Principal Research Scientist@NVIDIA
(Omniverse Physics)
Author of "Sane C++ Libraries"
https://github.com/Pagghiu/SaneCppLibraries
Videos: https://youtube.com/@Pagghiu
Site: https://pagghiu.github.io
Opinions are my own.
(Omniverse Physics)
Author of "Sane C++ Libraries"
https://github.com/Pagghiu/SaneCppLibraries
Videos: https://youtube.com/@Pagghiu
Site: https://pagghiu.github.io
Opinions are my own.
Sane C++ Libraries - October 2025
✅ Further reduction of internal dependencies
✅ Bring Your Own Containers example (InteropSTL)
✅ New bootstrap for SC::Tools written in C++
✅ Increased test coverage
✅ Improved CI
✅ Fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
✅ Further reduction of internal dependencies
✅ Bring Your Own Containers example (InteropSTL)
✅ New bootstrap for SC::Tools written in C++
✅ Increased test coverage
✅ Improved CI
✅ Fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
November 1, 2025 at 10:40 AM
Sane C++ Libraries - October 2025
✅ Further reduction of internal dependencies
✅ Bring Your Own Containers example (InteropSTL)
✅ New bootstrap for SC::Tools written in C++
✅ Increased test coverage
✅ Improved CI
✅ Fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
✅ Further reduction of internal dependencies
✅ Bring Your Own Containers example (InteropSTL)
✅ New bootstrap for SC::Tools written in C++
✅ Increased test coverage
✅ Improved CI
✅ Fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
Sane C++ Libraries - September 2025
✅Get rid of many inter-library dependencies
✅Stop accidental dependencies additions in CI
✅Free most libraries from dynamic allocation
✅Transform Build from lib to app
✅Add GDB Pretty Printer
✅Many smaller fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
✅Get rid of many inter-library dependencies
✅Stop accidental dependencies additions in CI
✅Free most libraries from dynamic allocation
✅Transform Build from lib to app
✅Add GDB Pretty Printer
✅Many smaller fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
September 30, 2025 at 10:31 PM
Sane C++ Libraries - September 2025
✅Get rid of many inter-library dependencies
✅Stop accidental dependencies additions in CI
✅Free most libraries from dynamic allocation
✅Transform Build from lib to app
✅Add GDB Pretty Printer
✅Many smaller fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
✅Get rid of many inter-library dependencies
✅Stop accidental dependencies additions in CI
✅Free most libraries from dynamic allocation
✅Transform Build from lib to app
✅Add GDB Pretty Printer
✅Many smaller fixes
github.com/Pagghiu/Sane...
#cpp #cplusplus
I've been adding to Sane C++ Libraries a GDB debug visualizer (pretty printer in gdb terminology) taking care of strings and containers.
In addition to the already existing ones for LLDB and MSVC Debugger (.natvis) I think we should be good now!
#cpp #cplusplus
In addition to the already existing ones for LLDB and MSVC Debugger (.natvis) I think we should be good now!
#cpp #cplusplus
September 5, 2025 at 7:19 PM
I've been adding to Sane C++ Libraries a GDB debug visualizer (pretty printer in gdb terminology) taking care of strings and containers.
In addition to the already existing ones for LLDB and MSVC Debugger (.natvis) I think we should be good now!
#cpp #cplusplus
In addition to the already existing ones for LLDB and MSVC Debugger (.natvis) I think we should be good now!
#cpp #cplusplus
Sane C++ Libraries are now available as amalgamated single-file libs!
They can be amalgamated offline or directly in-browser at: pagghiu.github.io/SaneCppLibra...
Each amalgamation lists dependencies on other amalgamated libs and the LOC of its header vs. implementation sections.
Have fun!
#cpp
They can be amalgamated offline or directly in-browser at: pagghiu.github.io/SaneCppLibra...
Each amalgamation lists dependencies on other amalgamated libs and the LOC of its header vs. implementation sections.
Have fun!
#cpp
August 11, 2025 at 1:51 PM
Sane C++ Libraries are now available as amalgamated single-file libs!
They can be amalgamated offline or directly in-browser at: pagghiu.github.io/SaneCppLibra...
Each amalgamation lists dependencies on other amalgamated libs and the LOC of its header vs. implementation sections.
Have fun!
#cpp
They can be amalgamated offline or directly in-browser at: pagghiu.github.io/SaneCppLibra...
Each amalgamation lists dependencies on other amalgamated libs and the LOC of its header vs. implementation sections.
Have fun!
#cpp
I have been removing many inter-dependencies between Sane C++ "Libraries" (mainly Strings/Memory/Containers)
The following libraries do not allocate anymore! 🎉
✅ Async
✅ File
✅ FileSystem
✅ FileSystemWatcher
✅ FileSystemIterator
✅ Process
✅ Socket
See: pagghiu.github.io/SaneCppLibra...
#cpp
The following libraries do not allocate anymore! 🎉
✅ Async
✅ File
✅ FileSystem
✅ FileSystemWatcher
✅ FileSystemIterator
✅ Process
✅ Socket
See: pagghiu.github.io/SaneCppLibra...
#cpp
July 23, 2025 at 8:21 PM
I have been removing many inter-dependencies between Sane C++ "Libraries" (mainly Strings/Memory/Containers)
The following libraries do not allocate anymore! 🎉
✅ Async
✅ File
✅ FileSystem
✅ FileSystemWatcher
✅ FileSystemIterator
✅ Process
✅ Socket
See: pagghiu.github.io/SaneCppLibra...
#cpp
The following libraries do not allocate anymore! 🎉
✅ Async
✅ File
✅ FileSystem
✅ FileSystemWatcher
✅ FileSystemIterator
✅ Process
✅ Socket
See: pagghiu.github.io/SaneCppLibra...
#cpp
I have been adding to Sane C++ Libraries some async primitives needed to send and receive bytes to and from UDP sockets (sendTo and receiveFrom).
As always implemented for IOCP, kqueue / epoll and io_uring!
Documentation:
pagghiu.github.io/SaneCppLibra...
Commit:
github.com/Pagghiu/Sane...
#cpp
As always implemented for IOCP, kqueue / epoll and io_uring!
Documentation:
pagghiu.github.io/SaneCppLibra...
Commit:
github.com/Pagghiu/Sane...
#cpp
June 11, 2025 at 8:25 PM
I have been adding to Sane C++ Libraries some async primitives needed to send and receive bytes to and from UDP sockets (sendTo and receiveFrom).
As always implemented for IOCP, kqueue / epoll and io_uring!
Documentation:
pagghiu.github.io/SaneCppLibra...
Commit:
github.com/Pagghiu/Sane...
#cpp
As always implemented for IOCP, kqueue / epoll and io_uring!
Documentation:
pagghiu.github.io/SaneCppLibra...
Commit:
github.com/Pagghiu/Sane...
#cpp
I've added a ProcessFork class to Sane C++ Libraries after discovering that "fork" on Windows can be approximated with RtlCloneUserProcess.
There are a ton of limitations but it's useful to serialize a data structure without blocking for IO or copying it for async IO.
Nice!
#cpp
There are a ton of limitations but it's useful to serialize a data structure without blocking for IO or copying it for async IO.
Nice!
#cpp
April 12, 2025 at 6:49 AM
I've added a ProcessFork class to Sane C++ Libraries after discovering that "fork" on Windows can be approximated with RtlCloneUserProcess.
There are a ton of limitations but it's useful to serialize a data structure without blocking for IO or copying it for async IO.
Nice!
#cpp
There are a ton of limitations but it's useful to serialize a data structure without blocking for IO or copying it for async IO.
Nice!
#cpp
An example of "struct dumping" in Sane C++ Libraries.
Anything SC::Segment based (Vector / String / VectorMap etc.) can be dumped and restored by just casting it (well, start_lifetime_as 🤭).
I guess it's not rocket science but recent additions make creating this simple and easy.
#cpp #cplusplus
Anything SC::Segment based (Vector / String / VectorMap etc.) can be dumped and restored by just casting it (well, start_lifetime_as 🤭).
I guess it's not rocket science but recent additions make creating this simple and easy.
#cpp #cplusplus
April 5, 2025 at 7:06 AM
An example of "struct dumping" in Sane C++ Libraries.
Anything SC::Segment based (Vector / String / VectorMap etc.) can be dumped and restored by just casting it (well, start_lifetime_as 🤭).
I guess it's not rocket science but recent additions make creating this simple and easy.
#cpp #cplusplus
Anything SC::Segment based (Vector / String / VectorMap etc.) can be dumped and restored by just casting it (well, start_lifetime_as 🤭).
I guess it's not rocket science but recent additions make creating this simple and easy.
#cpp #cplusplus
While debugging some of the recent container issues for Sane C++ Libraries I have been starting to track the number of allocation and deallocations calls.
The test suite by itself is doing 20K allocations and ~50K re-allocations 🫠.
Is it MAYBE time to add support for custom allocators? 😅
The test suite by itself is doing 20K allocations and ~50K re-allocations 🫠.
Is it MAYBE time to add support for custom allocators? 😅
March 18, 2025 at 9:43 PM
While debugging some of the recent container issues for Sane C++ Libraries I have been starting to track the number of allocation and deallocations calls.
The test suite by itself is doing 20K allocations and ~50K re-allocations 🫠.
Is it MAYBE time to add support for custom allocators? 😅
The test suite by itself is doing 20K allocations and ~50K re-allocations 🫠.
Is it MAYBE time to add support for custom allocators? 😅
I have been slapping volatile where I think it makes sense to force the optimizer think twice about making weird assumptions around that code.
Hopefully this will not be so bad performance wise.
I could maybe replace that offset == 0 conditional with some branchless code to improve things further...
Hopefully this will not be so bad performance wise.
I could maybe replace that offset == 0 conditional with some branchless code to improve things further...
March 17, 2025 at 11:14 PM
I have been slapping volatile where I think it makes sense to force the optimizer think twice about making weird assumptions around that code.
Hopefully this will not be so bad performance wise.
I could maybe replace that offset == 0 conditional with some branchless code to improve things further...
Hopefully this will not be so bad performance wise.
I could maybe replace that offset == 0 conditional with some branchless code to improve things further...
Most SSO implementations I have seen use an union of pointer+size and the buffer. They discriminate the union depending on value of capacity (if > than buffer array size then you’re on the heap and viceversa).
There is no pointer arithmetic in this case, correct.
There is no pointer arithmetic in this case, correct.
March 13, 2025 at 10:30 AM
Most SSO implementations I have seen use an union of pointer+size and the buffer. They discriminate the union depending on value of capacity (if > than buffer array size then you’re on the heap and viceversa).
There is no pointer arithmetic in this case, correct.
There is no pointer arithmetic in this case, correct.
Actually the second accepted answer from the SO post I've been linking above provides a more fundamental explanation about why this pointer arithmetics (that we all have done at least once 😜) has been declared UB (assuming it's being written by someone who knows...)
stackoverflow.com/a/67437638
stackoverflow.com/a/67437638
March 13, 2025 at 8:38 AM
Actually the second accepted answer from the SO post I've been linking above provides a more fundamental explanation about why this pointer arithmetics (that we all have done at least once 😜) has been declared UB (assuming it's being written by someone who knows...)
stackoverflow.com/a/67437638
stackoverflow.com/a/67437638
I am not a language lawyer but I've observed that without std::launder GCC optimizer figures out that segment.getData() == newData and possibly proves that newData is not stored anywhere (probably because pointer arithmetics like I'm doing in setData is UB) and it entirely removes the memmove call 🤯
March 11, 2025 at 9:17 PM
I am not a language lawyer but I've observed that without std::launder GCC optimizer figures out that segment.getData() == newData and possibly proves that newData is not stored anywhere (probably because pointer arithmetics like I'm doing in setData is UB) and it entirely removes the memmove call 🤯
I've found however some actual UB manifestations on GCC under -O2.
I have been pretty shocked to see GCC "optimizing away" some memcpy of the reconstructed pointer from "this" + offset.
To get avoid such UB I've had to add volatile to the methods reconstructing the original absolute pointer.
I have been pretty shocked to see GCC "optimizing away" some memcpy of the reconstructed pointer from "this" + offset.
To get avoid such UB I've had to add volatile to the methods reconstructing the original absolute pointer.
March 9, 2025 at 10:50 PM
I've found however some actual UB manifestations on GCC under -O2.
I have been pretty shocked to see GCC "optimizing away" some memcpy of the reconstructed pointer from "this" + offset.
To get avoid such UB I've had to add volatile to the methods reconstructing the original absolute pointer.
I have been pretty shocked to see GCC "optimizing away" some memcpy of the reconstructed pointer from "this" + offset.
To get avoid such UB I've had to add volatile to the methods reconstructing the original absolute pointer.
🟩 SC::Hashing
Compute MD5, SHA1 or SHA256 for a stream of bytes
🟢 C Bindings
🟥 SC::Http
Http parser, client and server
🟢 Improved to the level of self-hosting project blog (non-production)
Compute MD5, SHA1 or SHA256 for a stream of bytes
🟢 C Bindings
🟥 SC::Http
Http parser, client and server
🟢 Improved to the level of self-hosting project blog (non-production)
December 23, 2024 at 1:29 AM
🟩 SC::Hashing
Compute MD5, SHA1 or SHA256 for a stream of bytes
🟢 C Bindings
🟥 SC::Http
Http parser, client and server
🟢 Improved to the level of self-hosting project blog (non-production)
Compute MD5, SHA1 or SHA256 for a stream of bytes
🟢 C Bindings
🟥 SC::Http
Http parser, client and server
🟢 Improved to the level of self-hosting project blog (non-production)
🟩 SC::FileSystemWatcher
Files and directories notifications (Add, Remove, Rename, Modified).
🟢 Improve reliability
🟢 Support iOS using the (private) FSEvents framework
🟩 SC::FileSystem
File System Operations files and directories
🟢 Improve reliability
🟢 Symlinks creation
Files and directories notifications (Add, Remove, Rename, Modified).
🟢 Improve reliability
🟢 Support iOS using the (private) FSEvents framework
🟩 SC::FileSystem
File System Operations files and directories
🟢 Improve reliability
🟢 Symlinks creation
December 23, 2024 at 1:29 AM
🟩 SC::FileSystemWatcher
Files and directories notifications (Add, Remove, Rename, Modified).
🟢 Improve reliability
🟢 Support iOS using the (private) FSEvents framework
🟩 SC::FileSystem
File System Operations files and directories
🟢 Improve reliability
🟢 Symlinks creation
Files and directories notifications (Add, Remove, Rename, Modified).
🟢 Improve reliability
🟢 Support iOS using the (private) FSEvents framework
🟩 SC::FileSystem
File System Operations files and directories
🟢 Improve reliability
🟢 Symlinks creation
🟨 SC::Plugin
Minimal dependency based plugin system with hot-reload
🟢 Allow overriding sysroot path
🟢 Capture compiler and linker output
🟢 Use environment CFLAGS / LDFLAGS
🟢 QueryInterface-like mechanism
🟢 Include paths
🟢 Detect Visual Studio Path
Minimal dependency based plugin system with hot-reload
🟢 Allow overriding sysroot path
🟢 Capture compiler and linker output
🟢 Use environment CFLAGS / LDFLAGS
🟢 QueryInterface-like mechanism
🟢 Include paths
🟢 Detect Visual Studio Path
December 23, 2024 at 1:29 AM
🟨 SC::Plugin
Minimal dependency based plugin system with hot-reload
🟢 Allow overriding sysroot path
🟢 Capture compiler and linker output
🟢 Use environment CFLAGS / LDFLAGS
🟢 QueryInterface-like mechanism
🟢 Include paths
🟢 Detect Visual Studio Path
Minimal dependency based plugin system with hot-reload
🟢 Allow overriding sysroot path
🟢 Capture compiler and linker output
🟢 Use environment CFLAGS / LDFLAGS
🟢 QueryInterface-like mechanism
🟢 Include paths
🟢 Detect Visual Studio Path
🟩 SC::Process
Create Child processes, chain them, read outputs.
🟢 Improve API ease of use
🟢 Improve stability and reliability on Posix
🟢 Support custom working directory
🟢 Support custom environment variables
🟢 Support ignoring child process stdout/stderr
Create Child processes, chain them, read outputs.
🟢 Improve API ease of use
🟢 Improve stability and reliability on Posix
🟢 Support custom working directory
🟢 Support custom environment variables
🟢 Support ignoring child process stdout/stderr
December 23, 2024 at 1:29 AM
🟩 SC::Process
Create Child processes, chain them, read outputs.
🟢 Improve API ease of use
🟢 Improve stability and reliability on Posix
🟢 Support custom working directory
🟢 Support custom environment variables
🟢 Support ignoring child process stdout/stderr
Create Child processes, chain them, read outputs.
🟢 Improve API ease of use
🟢 Improve stability and reliability on Posix
🟢 Support custom working directory
🟢 Support custom environment variables
🟢 Support ignoring child process stdout/stderr
🟨 SC::Build
Minimal self-hosted build System where builds are described in C++
🟢 Linux: Makefiles
🟢 macOS: Makefiles + XCode
🟢 Windows: Visual Studio Projects
🟢 Multiple Configurations / Architectures / Projects
🟢 Documentation / Coverage
🟢 Downloads dependencies
Minimal self-hosted build System where builds are described in C++
🟢 Linux: Makefiles
🟢 macOS: Makefiles + XCode
🟢 Windows: Visual Studio Projects
🟢 Multiple Configurations / Architectures / Projects
🟢 Documentation / Coverage
🟢 Downloads dependencies
December 23, 2024 at 1:29 AM
🟨 SC::Build
Minimal self-hosted build System where builds are described in C++
🟢 Linux: Makefiles
🟢 macOS: Makefiles + XCode
🟢 Windows: Visual Studio Projects
🟢 Multiple Configurations / Architectures / Projects
🟢 Documentation / Coverage
🟢 Downloads dependencies
Minimal self-hosted build System where builds are described in C++
🟢 Linux: Makefiles
🟢 macOS: Makefiles + XCode
🟢 Windows: Visual Studio Projects
🟢 Multiple Configurations / Architectures / Projects
🟢 Documentation / Coverage
🟢 Downloads dependencies
SC::Tools
Single C++ files, self-bootstrapped on the fly, linking to Sane C++ Libraries for immediate execution.
They replace all shell scripts in the project with real C++ programs (repo / CI)
🟢 SC::Build - Build system
🟢 SC::Package - Host Tools downloader
🟢 SC::Format - Clang-Format helper
Single C++ files, self-bootstrapped on the fly, linking to Sane C++ Libraries for immediate execution.
They replace all shell scripts in the project with real C++ programs (repo / CI)
🟢 SC::Build - Build system
🟢 SC::Package - Host Tools downloader
🟢 SC::Format - Clang-Format helper
December 23, 2024 at 1:29 AM
SC::Tools
Single C++ files, self-bootstrapped on the fly, linking to Sane C++ Libraries for immediate execution.
They replace all shell scripts in the project with real C++ programs (repo / CI)
🟢 SC::Build - Build system
🟢 SC::Package - Host Tools downloader
🟢 SC::Format - Clang-Format helper
Single C++ files, self-bootstrapped on the fly, linking to Sane C++ Libraries for immediate execution.
They replace all shell scripts in the project with real C++ programs (repo / CI)
🟢 SC::Build - Build system
🟢 SC::Package - Host Tools downloader
🟢 SC::Format - Clang-Format helper
SCExample
WIP example browser showcase for the library
🟢 Based on Dear ImGui and sokol libraries ❤️
🟢 Power Efficient: redraws on SC::Async IO or input events
🟢 Hot-reloaded on the fly through SC::Plugin
🟢 Integrates SC::Async with native event Loop
🟢 Supports macOS, iOS, Linux and Windows
WIP example browser showcase for the library
🟢 Based on Dear ImGui and sokol libraries ❤️
🟢 Power Efficient: redraws on SC::Async IO or input events
🟢 Hot-reloaded on the fly through SC::Plugin
🟢 Integrates SC::Async with native event Loop
🟢 Supports macOS, iOS, Linux and Windows
December 23, 2024 at 1:29 AM
SCExample
WIP example browser showcase for the library
🟢 Based on Dear ImGui and sokol libraries ❤️
🟢 Power Efficient: redraws on SC::Async IO or input events
🟢 Hot-reloaded on the fly through SC::Plugin
🟢 Integrates SC::Async with native event Loop
🟢 Supports macOS, iOS, Linux and Windows
WIP example browser showcase for the library
🟢 Based on Dear ImGui and sokol libraries ❤️
🟢 Power Efficient: redraws on SC::Async IO or input events
🟢 Hot-reloaded on the fly through SC::Plugin
🟢 Integrates SC::Async with native event Loop
🟢 Supports macOS, iOS, Linux and Windows
🟨 SC::Async I/O Library
Think of a simplified libuv / Boost.ASIO 😌
🟢 No allocations!
🟢 Socket operations (send/receive/connect/accept)
🟢 File operations (read/write/close)
🟢 Child process watcher
🟢 Folder watcher
🟢 Background Threaded Work
Backends
🟢 epoll
🟢 io_uring
🟢 kqueue
🟢 IOCP
Think of a simplified libuv / Boost.ASIO 😌
🟢 No allocations!
🟢 Socket operations (send/receive/connect/accept)
🟢 File operations (read/write/close)
🟢 Child process watcher
🟢 Folder watcher
🟢 Background Threaded Work
Backends
🟢 epoll
🟢 io_uring
🟢 kqueue
🟢 IOCP
December 23, 2024 at 1:29 AM
🟨 SC::Async I/O Library
Think of a simplified libuv / Boost.ASIO 😌
🟢 No allocations!
🟢 Socket operations (send/receive/connect/accept)
🟢 File operations (read/write/close)
🟢 Child process watcher
🟢 Folder watcher
🟢 Background Threaded Work
Backends
🟢 epoll
🟢 io_uring
🟢 kqueue
🟢 IOCP
Think of a simplified libuv / Boost.ASIO 😌
🟢 No allocations!
🟢 Socket operations (send/receive/connect/accept)
🟢 File operations (read/write/close)
🟢 Child process watcher
🟢 Folder watcher
🟢 Background Threaded Work
Backends
🟢 epoll
🟢 io_uring
🟢 kqueue
🟢 IOCP
Hey, I just figured out that I've never been posting on BlueSky how nice the API from SC::Process from Sane C++ Libraries has become with the improvements added over the course of this year!
Check it out if you need to spawn some processes with I/O redirection!!! 🤭
pagghiu.github.io/SaneCppLibra...
Check it out if you need to spawn some processes with I/O redirection!!! 🤭
pagghiu.github.io/SaneCppLibra...
December 14, 2024 at 3:21 PM
Hey, I just figured out that I've never been posting on BlueSky how nice the API from SC::Process from Sane C++ Libraries has become with the improvements added over the course of this year!
Check it out if you need to spawn some processes with I/O redirection!!! 🤭
pagghiu.github.io/SaneCppLibra...
Check it out if you need to spawn some processes with I/O redirection!!! 🤭
pagghiu.github.io/SaneCppLibra...
🎉 New Sane C++ Libraries Video!
Today I'm implementing an Async Socket Streams abstraction (akin to node.js streams).
So far it can asynchronously read test data from a file, pipe it to a socket, read it from the other socket side and pipe it to a file.
Enjoy the video!
youtu.be/0x6TLV_ig-A
#cpp
Today I'm implementing an Async Socket Streams abstraction (akin to node.js streams).
So far it can asynchronously read test data from a file, pipe it to a socket, read it from the other socket side and pipe it to a file.
Enjoy the video!
youtu.be/0x6TLV_ig-A
#cpp
November 13, 2024 at 6:14 PM
🎉 New Sane C++ Libraries Video!
Today I'm implementing an Async Socket Streams abstraction (akin to node.js streams).
So far it can asynchronously read test data from a file, pipe it to a socket, read it from the other socket side and pipe it to a file.
Enjoy the video!
youtu.be/0x6TLV_ig-A
#cpp
Today I'm implementing an Async Socket Streams abstraction (akin to node.js streams).
So far it can asynchronously read test data from a file, pipe it to a socket, read it from the other socket side and pipe it to a file.
Enjoy the video!
youtu.be/0x6TLV_ig-A
#cpp