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cpi
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Tiny c++ interpreter
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cpi
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# Tiny C++ Interpreter [](https://github.com/treefrogframework/cpi/actions/workflows/actions.yml) [](https://opensource.org/licenses/MIT) [](https://github.com/treefrogframework/cpi/releases) Cpi is a tiny interpreter for C++20 or C++23. ## Requirements The following softwares are needed to build and execute cpi. The compiler is used as interpreter of cpi internally. * Qt tookit version 6 * Compiler - GNU C++ compiler, LLVM C++ compiler or MSVC C++ compiler ## Install Linux: ```sh $ qmake $ make $ sudo make install $ cpi -v cpi 2.2.0 ``` Windows (Command prompt for VS2022): ```bat ********************************************************************** ** Visual Studio 2022 Developer Command Prompt v17.14.7 ** Copyright (c) 2025 Microsoft Corporation ********************************************************************** [vcvarsall.bat] Environment initialized for: 'x64' > C:\Qt\6.7.0\msvc2019_64\bin\qtenv2.bat Setting up environment for Qt usage... > cd (cpi root directory) > qmake > nmake > cpi.bat -h (Run cpi command) Usage: cpi.exe [options] [file] [-] Tiny C++ Interpreter. Runs in interactive mode by default. Options: -?, -h, --help Displays help on commandline options. --help-all Displays help, including generic Qt options. -v, --version Displays version information. Arguments: file File to compile. - Reads from stdin. ``` ## Interactive Mode ``` $ cpi (Run cpi.bat in windows) cpi 2.2.0 Type ".help" for more information. Loaded INI file: /home/foo/.config/cpi/cpi.conf cpi> 3 << 23; (Bitwise operation) 25165824 cpi> int a = 3; cpi> ~a; (Complement) -4 cpi> a ^ 2; (XOR) 1 cpi> auto func = [](int n) { return n*n; }; (Lambda function) cpi> func(3); 9 cpi> .quit ( or press ctrl+c ) ``` Code can be pasted. ```cpp $ cpi (Run cpi.bat in windows) cpi> #include <map> (Paste code here) #include <iostream> int main() { std::map<int, std::string> m = { {1, "one"}, {2, "two"} }; if (auto it = m.find(2); it != m.end()) { std::cout << it->second << std::endl; } } (Press enter) two (The result of the executed output) ``` ## Executive mode Save C++ source code as *hello.cpp*. ```cpp #include <iostream> int main() { std::cout << "Hello world\n"; return 0; } ``` Run cpi in command line. ```sh $ cpi hello.cpp Hello world ``` Immediately compiled and executed! Almost a script language, but the source file is also C++ program which a compiler can compile successfully. Next code outputs a square root of input argument. Specify options for compiler or linker with "CompileOptions: " word. In this example, linking math library specified by "-lm" option. ```cpp #include <iostream> #include <cmath> #include <cstdlib> int main(int argc, char *argv[]) { if (argc != 2) return 0; std::cout << sqrt(atoi(argv[1])) << std::endl; return 0; } // CompileOptions: -lm ``` ```sh $ cpi sqrt.cpp 2 1.41421 $ cpi sqrt.cpp 3 1.7320 ``` The following is sample code for generator using coroutine. ```cpp #include <generator> #include <iostream> std::generator<int> num_generator(int from, int to) { for (int i = from; i <= to; i++) { co_yield i; } } int main() { long long sum = 0; for (auto v : num_generator(1, 1000000)) { sum += v; } std::cout << sum << std::endl; return 0; } // CompileOptions: -std=c++23 ``` ```sh $ cpi main.cpp 500000500000 ``` Furthermore, pkg-config command can be used for *CompileOptions*. ```cpp #include <cblas.h> #include <iostream> int main() { // 2x2 Matrix int M = 2, N = 2, K = 2; double A[4] = {1.0, 2.0, 3.0, 4.0}; double B[4] = {5.0, 6.0, 7.0, 8.0}; double C[4]; // General Matrix-Matrix multiplication cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, M, N, K, 1.0, A, K, B, N, 0.0, C, N); // Print results std::cout << "Result of A * B = C:" << std::endl; for (int i = 0; i < 2; ++i) { for (int j = 0; j < 2; ++j) { std::cout << C[i * 2 + j] << " "; } std::cout << std::endl; } return 0; } // CompileOptions: `pkg-config --cflags --libs openblas` ``` ```sh $ cpi dgemm.cpp Result of A * B = C: 19 22 43 50 ``` Qt application can also be run. ```cpp #include <QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication app(argc, argv); QLabel label("Hello, world!"); label.setAlignment(Qt::AlignCenter); label.setWindowTitle("Hello"); label.resize(200, 100); label.show(); return app.exec(); } // CompileOptions: `pkg-config --cflags --libs Qt6Widgets` -Wl,-rpath,`pkg-config --variable=libdir Qt6Widgets` ``` ```sh $ cpi helloworld_qt.cpp ``` #### Running like a scripting language Adding a shebang, save as *hello.cpps*. No longer compiled in a C++ compiler successfully. ```cpp #!/usr/bin/env cpi #include <iostream> int main() { std::cout << "Hello world\n"; return 0; } ``` ```sh $ chmod +x hello.cpps $ ./hello.cpps Hello world ``` Yes, a shell script. I named it CppScript. ## Help ``` cpi> .help .conf Display the current values for various settings. .help Display this help. .rm LINENO Remove the code of the specified line number. .show Show the current source code. .quit Exit this program. ``` ## Download [Download Page](https://github.com/treefrogframework/cpi/releases) ## Web Site http://treefrogframework.github.io/cpi/
