master , devel

libcdada - basic data structures in C (libstdc++ wrapper)

Small library that offers basic data structures (list, set, map…) in a pure C API for user-space applications. Key features:

• Easy to use, portable
• No “magic” MACROs, and no need to modify your data structures (except, perhaps, for __attribute__((packed)))
• Stable and well-tested backend engine (libstdc++) for most of the data structures
• Reasonable performance - comparable to libstdc++

Example

#include <cdada/list.h>

int x, val=0;
cdada_list_t* my_list = cdada_list_create(int);

//Add to list {10, 11, 5, 5}
x=10;
cdada_list_push_back(my_list, &x);
x=11;
cdada_list_push_back(my_list, &x);
x=5;
cdada_list_push_back(my_list, &x);
cdada_list_push_back(my_list, &x);

//Get element in position 1
cdada_list_get(my_list, 1, &val);
assert(val == 11);

//First/last
cdada_list_first(my_list, &val);
assert(val == 10);

//Add {10, 11, 5, 11}
x=11;
cdada_list_push_back(my_list, &val);

//Traverse list
cdada_list_traverse(my_list, my_iterator_func, opaque);

#include <cdada/str.h>

cdada_str_t* s = cdada_str_create("One string");
fprintf(stdout, "%s\n", cdada_str(s));

//Reset
cdada_str_set(s, "This is a test");
fprintf(stdout, "%s\n", cdada_str(s));

cdada_str_append(s, " simple string");

cdada_str_lower(s);
cdada_str_replace_all(s, "test ", "");

//Will print: "this is a simple string"
fprintf(stdout, "%s\n", cdada_str(s));

More examples for map and set and custom containers in the examples folder.

Documentation

Public API:

• cdada.h: includes all headers listed below
  • cdada/bbitmap.h: big bitmap (> 64bit)
  • cdada/list.h: an ordered list of objects (equivalent to std::list)
  • cdada/map.h: a hashmap {key -> value}, with unique keys (equivalent to std::map)
  • cdada/queue.h: queue (FIFO queue) implementation (equivalent to std::queue)
  • cdada/set.h: a set of objects (equivalent to std::set)
  • cdada/stack.h: stack (LIFO queue) implementation (equivalent to std::stack)
  • cdada/str.h: a string (equivalent to std::string)
  • cdada/utils.h: error codes and utility functions

libcdada is not thread-safe.

Default containers support 1-256 bytes keys (values for lists), but they will perform better when aligned to {1,2,4,8,32,64,128,256} bytes - keys are padded to a power of 2 bytes.

Custom containers

For larger keys (any length), optimal memory usage and performance take a look at libcdada’s custom containers.

Benchmarking

Take a look at benchmarking for an rough idea of the overhead of libcdada compared to libstdc++.

Installation

Requirements:

• POSIX system
• C and C++ gcc compatible compilers (gcc, icc, clang…)
• Automake
• Autoconf
• Libtool
• libstdc++ (C++98)

sh autogen.sh
cd build
../configure
sudo make install

Windows support

The library solely depends on libstdc++, so it should be very easy to port it to Windows. If you are interested, consider submitting a PR.

Contact

Marc Sune < marcdevel (at) gmail (dot) com>