{"id":16807514,"url":"https://github.com/youyuanwu/env-cpp","last_synced_at":"2025-08-12T00:33:34.003Z","repository":{"id":48690249,"uuid":"382688639","full_name":"youyuanwu/env-cpp","owner":"youyuanwu","description":"env-cpp is a C++ lib for parsing env vars into struct, using 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env-cpp\n\nParse environment variables to C++ struct, base on reflection [refl-cpp](https://github.com/veselink1/refl-cpp)\n\nWork in progress.\n\n## Example\n```cpp\n#include \u003ccstdlib\u003e\n#include \"gtest/gtest.h\"\n#include \"env.hpp\"\n\n// Declare struct as usual\nstruct Env\n{\n    std::string EnvCPPString1;\n    std::string EnvCPPString2;\n    int EnvCPPInt;\n    long EnvCPPLong;\n    float EnvCPPFloat;\n};\n\n// Add struct meta data\n// This needs to be in global namespace, and is a limitation of refl-cpp pkg.\nREFL_TYPE(Env)\n    REFL_FIELD(EnvCPPString1, env::Name(\"EnvString1Override\"))\n    REFL_FIELD(EnvCPPString2, env::Default(\"EnvString2DefaultValue\"))\n    REFL_FIELD(EnvCPPInt, env::Required())\n    REFL_FIELD(EnvCPPLong)\n    REFL_FIELD(EnvCPPFloat)\nREFL_END\n\nTEST(Parse, Ok) {\n    bool ret;\n\n    std::string EnvCPPString1 = \"Override Value\";\n    ret = env::SetEnvVar(\"EnvString1Override\",EnvCPPString1);\n    EXPECT_EQ(ret, true);\n\n    // string2 is not present in env\n    ret = env::UnsetEnvVar(\"EnvCPPString2\");\n    EXPECT_EQ(ret, true);\n\n    int EnvCPPInt = 10;\n    ret = env::SetEnvVar(\"EnvCPPInt\",\"10\");\n    EXPECT_EQ(ret, true);\n\n    long EnvCPPLong = 20;\n    ret = env::SetEnvVar(\"EnvCPPLong\",\"20\");\n    EXPECT_EQ(ret, true);\n\n    float EnvCPPFloat = 10.1;\n    ret = env::SetEnvVar(\"EnvCPPFloat\",\"10.1\");\n    EXPECT_EQ(ret, true);\n\n    // Parse reads the Env struct meta-data and retrieves env values from OS\n    Env e;\n    env::Parse(e);\n\n    // Check Env e fields values are populated\n    EXPECT_EQ(e.EnvCPPString1,EnvCPPString1);\n    EXPECT_EQ(e.EnvCPPString2,std::string(\"EnvString2DefaultValue\"));\n    EXPECT_EQ(e.EnvCPPInt,EnvCPPInt);\n    EXPECT_EQ(e.EnvCPPLong,EnvCPPLong);\n    EXPECT_EQ(e.EnvCPPFloat,EnvCPPFloat);\n}\n```\n\n## Features\n### Name\nUse `env::Name(\"name override\")` to override the struct name for env look up from OS.\n### Default\nUse `env::Default(\"default value\")` to set default value for struct if env not found in OS.\n### Required\nUse `env::Required()` to mark env as required. `env::Parse()` will throw exception when env is not found in OS.","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fyouyuanwu%2Fenv-cpp","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fyouyuanwu%2Fenv-cpp","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fyouyuanwu%2Fenv-cpp/lists"}