[{"_1":2,"_152":-5,"_153":-5},"loaderData",{"_3":4,"_13":14,"_20":21,"_131":132},"root",{"_5":-5,"_6":-7,"_7":8,"_9":-7,"_10":11,"_12":-7},"currentUser","primaryEmail","siteVerification","6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI","toast","enableDev",false,"incidentStatus","routes/_layout",{"_15":-5,"_16":17,"_18":17,"_19":11},"username","isAskGordonEnabled",true,"isUsingNewTemplate","showMinimalLanding","routes/_layout.r.$namespace.$reponame",{"_22":23,"_24":-5,"_25":11,"_26":11,"_27":28,"_29":30,"_31":-5,"_32":11,"_33":34,"_83":-5,"_84":85,"_124":-5,"_125":11,"_126":17,"_127":11,"_128":-5,"_129":130},"canonicalUrl","https://hub.docker.com/r/lukasmartinelli/py14/tags","mcpServer","canSeeDockerfile","canSeeAutobuilds","namespace","lukasmartinelli","reponame","py14","cloudBuildSource","isAutobuildsAvailable","repo",{"_35":36,"_37":38,"_40":41,"_42":43,"_44":11,"_45":46,"_47":48,"_49":50,"_52":30,"_27":28,"_53":54,"_55":39,"_56":57,"_58":59,"_60":61,"_62":-5,"_63":57,"_64":65,"_66":11,"_67":28,"_68":69,"_74":17,"_75":76,"_80":28,"_81":82},"categories",[],"content_types",[39],"image","date_registered","2016-08-19T08:32:54.363994Z","description","Python to C++ 14 transpiler server","is_private","last_updated","2018-06-03T13:52:26.080126Z","last_modified","2024-10-16T13:48:34.145251Z","media_types",[51],"application/vnd.docker.container.image.v1+json","name","pull_count",23643,"repository_type","star_count",0,"status",1,"status_description","active","source","collaborator_count","full_description","# Python to C++ 14 transpiler\n[![Wercker Status](https://img.shields.io/wercker/ci/54c7dd9680c707522500363b.svg?style=flat)](https://app.wercker.com/project/bykey/faee5da9a0f6981723b39973d3137158)\n[![Coverage Status](https://coveralls.io/repos/lukasmartinelli/py14/badge.svg?branch=master)](https://coveralls.io/r/lukasmartinelli/py14?branch=master)\n[![Scrutinizer Code Quality](https://img.shields.io/scrutinizer/g/lukasmartinelli/py14.svg?style=flat)](https://scrutinizer-ci.com/g/lukasmartinelli/py14/?branch=master)\n[![Code Health](https://landscape.io/github/lukasmartinelli/py14/master/landscape.svg?style=flat)](https://landscape.io/github/lukasmartinelli/py14/master)\n\n> :warning: This repository is no longer actively maintained by Lukas Martinelli.\n\nThis is a little experiment that shows how far you can go with the\nC++ 14 `auto` return type and templates.\nC++14 has such powerful type deduction that it is possible to transpile\nPython into C++ without worrying about the missing type annotations in python. Only a small subset of Python is working and you will encounter many bugs. The goal is to showcase the power of C++14 templates and not to create a fully functional transpiler.\n\n## Example\n\nOriginal Python version.\n\n```python\ndef factorial(num):\n\tif num <= 1:\n\t\treturn num\n\treturn factorial(num-1) * num\n```\n\nTranspiled C++ template.\n\n```c++\ntemplate auto factorial(T1 num) {\n\tif (num <= 1) {\n\t\treturn num;\n\t}\n\treturn factorial(num - 1) * num;\n}\n```\n\n## How it works\n\nConsider a `map` implementation.\n\n```python\ndef map(values, fun):\n\tresults = []\n\tfor v in values:\n\t\tresults.append(fun(v))\n\treturn results\n```\n\nThis can be transpiled into the following C++ template.\n\n```c++\ntemplate \nauto map(T1 values, T2 fun) {\n\tstd::vector()))> results{};\n\tfor (auto v : values) {\n\t\tresults.push_back(fun(v));\n\t}\n\treturn results;\n}\n```\n\nThe parameters and the return types are deduced automatically\nIn order to define the results vector we need to:\n\n1. Deduce the type for v returned from the values range\n `using v_type = typename decltype(values)::value_type`\n2. Deduce the return type of `fun` for call with parameter v\n `decltype(fun(v))`\n3. Because we dont know v at the time of definition we need to fake it\n `std::declval()`\n4. This results in the fully specified value type of the results vector\n `decltype(fun(std::declval()))`\n\n## Trying it out\n\nRequirements:\n\n- clang 3.5\n\nTranspiling:\n\n```\n./py14.py fib.py > fib.cpp\n```\n\nCompiling:\n\n```\nclang++ -Wall -Wextra -std=c++14 -Ipy14/runtime fib.cpp\n```\n\nRun regression tests:\n\n```\ncd regtests\nmake\n```\n\nRun tests\n\n```\npip install -r requirements.txt\npy.test --cov=py14\n```\n\n## More Examples\n\n**Probability Density Function (PDF)**\n\n```python\ndef pdf(x, mean, std_dev):\n\tterm1 = 1.0 / ((2 * math.pi) ** 0.5)\n\tterm2 = (math.e ** (-1.0 * (x-mean) ** 2.0 / 2.0 * (std_dev ** 2.0)))\n\treturn term1 * term2\n```\n\n```c++\ntemplate \nauto pdf(T1 x, T2 mean, T3 std_dev) {\n\tauto term1 = 1.0 / std::pow(2 * py14::math::pi, 0.5);\n\tauto term2 = std::pow(py14::math::e, -1.0 * std::pow(x - mean, 2.0) / 2.0 *\n\t\t\t\t\t\t\t\t\t\t\t\tstd::pow(std_dev, 2.0));\n\treturn term1 * term2;\n}\n```\n\n**Fibonacci**\n\n```python\ndef fib(n):\n\tif n == 1:\n\t\treturn 1\n\telif n == 0:\n\t\treturn 0\n\telse:\n\t\treturn fib(n-1) + fib(n-2)\n```\n\n```c++\ntemplate auto fib(T1 n) {\n\tif (n == 1) {\n\t\treturn 1;\n\t} else {\n\t\tif (n == 0) {\n\t\t\treturn 0;\n\t\t} else {\n\t\t\treturn fib(n - 1) + fib(n - 2);\n\t\t}\n\t}\n}\n```\n\n**Bubble Sort**\n\n```python\ndef sort(seq):\n\tL = len(seq)\n\tfor _ in range(L):\n\t\tfor n in range(1, L):\n\t\t\tif seq[n] < seq[n - 1]:\n\t\t\t\tseq[n - 1], seq[n] = seq[n], seq[n - 1]\n\treturn seq\n```\n\n```c++\ntemplate auto sort(T1 seq) {\n\tauto L = seq.size();\n\tfor (auto _ : rangepp::range(L)) {\n\t\tfor (auto n : rangepp::range(1, L)) {\n\t\t\tif (seq[n] < seq[n - 1]) {\n\t\t\t\tstd::tie(seq[n - 1], seq[n]) = std::make_tuple(seq[n], seq[n - 1]);\n\t\t\t}\n\t\t}\n\t}\n\treturn seq;\n}\n```\n\n## Working Features\n\nOnly bare functions using the basic language features are supported.\n\n- [ ] classes\n- [x] functions\n- [x] lambdas\n- [ ] multiple inheritance\n- [ ] operator overloading\n- [ ] function and class decorators\n- [ ] getter/setter function decorators\n- [ ] list comprehensions\n- [ ] yield (generator functions)\n- [ ] function calls with `*args` and `**kwargs`\n\nLanguage Keywords\n\n- [ ] global, nonlocal\n- [x] while, for, continue, break\n- [x] if, elif, else\n- [ ] try, except, raise\n- [x] def, lambda\n- [ ] new, class\n- [x] from, import, as\n- [ ] pass, assert\n- [x] and, or, is, in, not\n- [x] return\n- [ ] yield\n\nBuiltins\n- [ ] dir\n- [ ] type\n- [ ] hasattr\n- [ ] getattr\n- [ ] setattr\n- [ ] issubclass\n- [ ] isinstance\n- [ ] dict\n- [ ] list\n- [ ] tuple\n- [x] int\n- [ ] float\n- [x] str\n- [ ] round\n- [x] range\n- [ ] sum\n- [x] len\n- [ ] map\n- [ ] filter\n- [ ] min\n- [ ] max\n- [ ] abs\n- [ ] ord\n- [ ] chr\n- [ ] open\n\nData Structures\n\n- [x] list\n- [ ] Set\n- [x] String\n- [ ] Dict\n","has_starred","hub_user","immutable_tags_settings",{"_70":11,"_71":72},"enabled","rules",[73],".*","is_automated","permissions",{"_77":17,"_78":11,"_79":11},"read","write","admin","user","storage_size",426222484,"orgData","recentTags",[86],{"_87":39,"_88":89,"_90":91,"_92":93,"_94":95,"_45":113,"_114":89,"_115":28,"_116":51,"_52":117,"_118":119,"_120":104,"_121":113,"_122":61,"_123":17},"content_type","creator",104619,"full_size",214571825,"id",4406705,"images",[96],{"_97":98,"_99":100,"_101":102,"_103":104,"_105":106,"_107":108,"_109":102,"_110":-5,"_111":91,"_58":61,"_112":-5},"architecture","amd64","digest","sha256:fb73fbc4a1291091addc54ebf1236efad2adcce45d68710fb5b3385c9b358c51","features","","last_pulled","2026-09-11T04:54:11.220585579Z","last_pushed","2018-06-03T13:52:26Z","os","linux","os_features","os_version","size","variant","2018-06-03T13:52:25.553827Z","last_updater","last_updater_username","media_type","latest","repository",866027,"tag_last_pulled","tag_last_pushed","tag_status","v2","sbxKitMetadata","isPotentialSpam","isHubSbxKitsEnabled","displaySecurityMetadata","tagAttestations","tagsHaveAttestations",[],"routes/_layout.r.$namespace.$reponame.tags",{"_33":133,"_140":141,"_129":150,"_151":11},{"_35":134,"_37":135,"_40":41,"_42":43,"_44":11,"_45":46,"_47":48,"_49":136,"_52":30,"_27":28,"_53":54,"_55":39,"_56":57,"_58":59,"_60":61,"_62":-5,"_63":57,"_64":65,"_66":11,"_67":28,"_68":137,"_74":17,"_75":139,"_80":28,"_81":82},[],[39],[51],{"_70":11,"_71":138},[73],{"_77":17,"_78":11,"_79":11},"tags",{"_142":59,"_143":-5,"_144":-5,"_145":146},"count","next","previous","results",[147],{"_87":39,"_88":89,"_90":91,"_92":93,"_94":148,"_45":113,"_114":89,"_115":28,"_116":51,"_52":117,"_118":119,"_120":104,"_121":113,"_122":61,"_123":17},[149],{"_97":98,"_99":100,"_101":102,"_103":104,"_105":106,"_107":108,"_109":102,"_110":-5,"_111":91,"_58":61,"_112":-5},[],"canDeleteTags","actionData","errors"]

lukasmartinelli/py14

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