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Pranav Srinivas Kumar 2019-03-31 11:43:24 -04:00 committed by GitHub
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@ -6,7 +6,9 @@
* Requires C++17 * Requires C++17
* MIT License * MIT License
## Positional Arguments ## Examples
### Positional Arguments
```cpp ```cpp
argparse::ArgumentParser program("main"); argparse::ArgumentParser program("main");
@ -20,7 +22,7 @@ std::string input = program.get("input"); // "rocket.msh"
std::string output = program.get("output"); // "thrust_profile.csv" std::string output = program.get("output"); // "thrust_profile.csv"
``` ```
## Optional Arguments ### Optional Arguments
```cpp ```cpp
argparse::ArgumentParser program("main"); argparse::ArgumentParser program("main");
@ -39,7 +41,7 @@ std::string config = program.get("--config"); // "config.json"
int num_iterations = program.get<int>("-n"); // 36 int num_iterations = program.get<int>("-n"); // 36
``` ```
## Vector of Arguments ### Vector of Arguments
```cpp ```cpp
argparse::ArgumentParser program("main"); argparse::ArgumentParser program("main");
@ -53,7 +55,7 @@ program.parse_args({"./main", "--input_files", "config.yml", "System.xml"});
auto files = program.get<std::vector<std::string>>("--input_files"); // {"config.yml", "System.xml"} auto files = program.get<std::vector<std::string>>("--input_files"); // {"config.yml", "System.xml"}
``` ```
## Toggle Arguments ### Toggle Arguments
```cpp ```cpp
argparse::ArgumentParser program("test"); argparse::ArgumentParser program("test");
@ -67,7 +69,7 @@ program.parse_args({ "./main", "--verbose" });
auto a = program.get<bool>("--verbose"); // true auto a = program.get<bool>("--verbose"); // true
``` ```
## Compound Arguments ### Compound Arguments
```cpp ```cpp
argparse::ArgumentParser program("test"); argparse::ArgumentParser program("test");
@ -91,7 +93,7 @@ auto b = program.get<bool>("-b"); // true
auto c = program.get<std::vector<float>>("-c"); // {3.14f, 2.718f} auto c = program.get<std::vector<float>>("-c"); // {3.14f, 2.718f}
``` ```
## Positional Arguments with Compound Toggle Arguments ### Positional Arguments with Compound Toggle Arguments
```cpp ```cpp
argparse::ArgumentParser program("test"); argparse::ArgumentParser program("test");
@ -124,3 +126,22 @@ auto b = program.get<bool>("-b"); // true
auto c = program.get<std::vector<float>>("-c"); // {3.14f, 2.718f} auto c = program.get<std::vector<float>>("-c"); // {3.14f, 2.718f}
auto files = program.get<std::vector<std::string>>("--files"); // {"a.txt", "b.txt", "c.txt"} auto files = program.get<std::vector<std::string>>("--files"); // {"a.txt", "b.txt", "c.txt"}
``` ```
### Construct class objects from arguments
```cpp
argparse::ArgumentParser program("json_test");
program.add_argument("config")
.action([](const std::string& value) {
// read a JSON file
std::ifstream stream(value);
nlohmann::json config_json;
stream >> config_json;
return config_json;
});
program.parse_args({"./test", "config.json"});
nlohmann::json config = program.get<nlohmann::json>("config");
```