NanoSTL, a portable and small subset of C++ STL.

NanoSTL is good for using STL-like feature in your C++ application and C++-like JIT compiler.

NanoSTL is portable, it should run well on many environments including Windows, Linux, macOS, x86, ARM, SPARC, etc.

NanoSTL should work well on C++11 compiler or later. (C++03 or earlier is not supported)

Status

Eearly testing stage. Not ready for the production use.

Features

Experimental CUDA support. You can use NanoSTL on device functions.
- See sandbox/cuda/

Example

NanoSTL is header-only library. No need to compile/link with .cc Some function(e.g. std::to_string) requires the implementation, thus must define NANOSTL_IMPLEMENTATION in single *.cc file.

#define NANOSTL_IMPLEMENTATION
#include <nanosring.h>

...

Supported features

vector
string
- to_string(float)(using ryu)
- to_string(double)(using ryu)
- stof(string to float. using ryu_parse)
- stod(string to double. using ryu_parse)
algorithm
limits
- numeric_limits<T>::min
- numeric_limits<T>::max
- numeric_limits<T>::epsilon()
- numeric_limits<T>::digits10
- numeric_limits<float>::denorm_min()
- numeric_limits<double>::denorm_min()
- numeric_limits<float>::inifinity()
- numeric_limits<float>::quiet_NaN()
- numeric_limits<float>::signaling_NaN()
- numeric_limits<double>::inifinity()
- numeric_limits<double>::quiet_NaN()
- numeric_limits<double>::signaling_NaN()
map

Be careful! Not all C++ STL functions are supported for each module.

Limited support

math functions

Other list of implementation status

cassert
- assert
  - CUDA
  - Other platform
To be filled...

Supported architectures

64bit arctecture only.
Big endian and little endian
- Some math functions may not run on big endian machine.
CUDA device.

Supported compilers

Even though NanoSTL should be compilable with older and various C++ compilers, at least following compilers shold work well.

gcc 4.4.7+
- NanoSTL itself can be compilable with gcc 4.2.4(fails to compile Catch unit test code)
clang 3.4+

Supported threading library

For thread and parallel STL feature, threading library is required.

pthread(non-Windows)
Win32 thread(Windows)

Types

NanoSTL assumes following type definitions.

char : 8bit(NOTE: unsigned is default for some ARM compiler. Use signed char if you want signed 8bit type)
short : 16bit
int : 32bit
long long : 64bit
float : 32bit IEEE754 floating point.
double : 64bit IEEE754 floating point.

long and int long is not recommended to use. Please use cstdint typedefs.

Compiler macros

NANOSTL_BIG_ENDIAN Set endianness to big endian. Considering to support various compilers, user must explicitly specify endianness to the compiler. Default is little endian.
NANOSTL_NO_IO Disable all I/O operation(e.g. iostream). Useful for embedded devices.
NANOSTL_USE_EXCEPTION Enable exception feature(may not be available for all STL functions)
NANOSTL_NO_THREAD Disable thread, atomic and mutex feature.
NANOSTL_PSTL Enable parallel STL feature. Requires C++17 compiler. This also undefine NANOSTL_NO_THREAD

header-only mode

You can define NANOSTL_IMPLEMENTATION to define the implementation of some STL functions. This is useful if you want to use NanoSTL as a header-only library (No need to compile/add .cc)

#define NANOSTL_IMPLEMENTATION
#include <nanostl.h>

Differences compared to (full featured) C++ STL

No thread safety Currently NanoSTL is not thread safe
- Application must care about the thread safety
- For example, need to use mutex or lock for nanostl::vector::push_back() operation if you are accesing nanostl::vector object from multiple threads.
RTTI and exception is basically not supported.
- some API may support it through NANOSTL_USE_EXCEPTION
Returns NULL when memory allocation failed(no bad_alloc)
stof, stod
- Return (signaling) NaN for invalid input

TODO

Developer note

Generate single header file.

$ python scripts/generateSingleHeader.py

Each .h must have wrapped with like this:

#ifndef NANOSTL_*_H_`
#define NANOSTL_*_H_`

// comment after `#endif` is required!
#endif // NANOSTL_*_H_

to extract codes for single header generation. (no #pragma once)

Unit tests

Compiling unit test requires C++11 compiler since unit test uses some C++11 math functions for the reference.

$ cd tests
$ make
$ ./test

Debugging

Use NANOSTL_DEBUG define for debugging.

Licenss

Unless otherwise expressed, NanoSTL is licensed under MIT license. Some functions in nanomath is licenced under modified BSD license.

Third party licenses

SipHash: cc0 license. https://www.131002.net/siphash/
expected-lite, any-lite, optional-lie, variant-lite: Copyright by Martin Moene. Boost Software License 1.0. https://github.com/martinmoene/variant-lite
acutest : MIT license.
faster math functions: Some math functions implemented in nanomath is grabbed from OpenImageIO fmath.h, which is licensed under modified BSD license. https://github.com/OpenImageIO/oiio/
ryu(floating point <-> string converter). NanoSTL choose Boost 1.0 license. https://github.com/ulfjack/ryu
libc++: Apache License v2.0 with LLVM Exceptions
mattiasgustavsson/libs: MIT license. https://github.com/mattiasgustavsson/libs
taocpp/tuple : MIT license. https://github.com/taocpp/tuple
fast_float : NanoSTL Choose MIT license(fast_float is MIT/Apache2.0 dual license). https://github.com/fast_float/fast_float

lighttransport/nanostl

lighttransport

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