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https://github.com/massimo-marino/memvar
A C++17 implementation of a variable with memory of its previous values.
https://github.com/massimo-marino/memvar
cpp cpp17 cpp1z timestamped-variable timetagged-variable variable-with-memory
Last synced: about 10 hours ago
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A C++17 implementation of a variable with memory of its previous values.
- Host: GitHub
- URL: https://github.com/massimo-marino/memvar
- Owner: massimo-marino
- License: mit
- Created: 2017-10-20T12:52:28.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2024-05-02T14:52:12.000Z (5 months ago)
- Last Synced: 2024-09-24T21:04:14.628Z (about 16 hours ago)
- Topics: cpp, cpp17, cpp1z, timestamped-variable, timetagged-variable, variable-with-memory
- Language: C++
- Homepage:
- Size: 88.9 KB
- Stars: 3
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# memvar
C++17 implementation of a variable with memory of its past values.
## Requirements
`cmake 3.26.3` is used to compile the sources.
The cmake file compiles with `C++17`.
The unit tests are implemented in googletest: be sure you have installed googletest to compile.
To run the performance tests, a RAM of 16GB is needed. If less RAM is available, just reduce the value of `historyCapacity` (line 15 in perfTest.cpp).
## Run Unit Tests
```bash
$ git clone https://github.com:massimo-marino/memvar.git
$ cd memvar/unitTests
$ mkdir build
$ cd build
$ cmake ..
$ make
$ ./memvar-unit-tests
```
If needed (cmake fails), copy `FindGMock.cmake` to the Modules directory of cmake.
In my installation located in my home, it is in `~/cmake-3.26.3-linux-x86_64/share/cmake-3.26/Modules/`
## Run Performance Tests
```bash
$ git clone https://github.com:massimo-marino/memvar.git
$ cd memvar/perfTests
$ mkdir build
$ cd build
$ cmake ..
$ make
$ ./perfTests
```
## How to Use it
See the source code and the unit tests for examples of use.
## Example: Yet Another Way to Compute the Fibonacci Numbers
```C++
void fibonacciNumbers()
{
// The type stored in the memvar
using memvarType = uint64_t;
// define the memvar with a history capacity of 100 values
// and store fib(0) = 0
memvar::memvar fibs{0, 100};
// store fib(1) = 1
fibs = 1;
// compute and store fib(2) = fib(1) + fib(0)
// through fib(93) = fib(92) + fib(91)
for(int i = 1; i <= 92; ++i)
{
// compute fib(n+1) = fib(n) + fib(n-1)
fibs += fibs(1);
}
// print the first 94 fibonacci numbers
std::cout << "fibs: "; fibs.printHistoryData();
}
```