positional_arity.cpp
1.12 KB
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#include "CLI/CLI.hpp"
int main(int argc, char **argv) {
CLI::App app("test for positional arity");
auto numbers = app.add_option_group("numbers", "specify key numbers");
auto files = app.add_option_group("files", "specify files");
int num1 = -1, num2 = -1;
numbers->add_option("num1", num1, "first number");
numbers->add_option("num2", num2, "second number");
std::string file1, file2;
files->add_option("file1", file1, "first file")->required();
files->add_option("file2", file2, "second file");
// set a pre parse callback that turns the numbers group on or off depending on the number of arguments
app.preparse_callback([numbers](size_t arity) {
if(arity <= 2) {
numbers->disabled();
} else {
numbers->disabled(false);
}
});
CLI11_PARSE(app, argc, argv);
if(num1 != -1)
std::cout << "Num1 = " << num1 << '\n';
if(num2 != -1)
std::cout << "Num2 = " << num2 << '\n';
std::cout << "File 1 = " << file1 << '\n';
if(!file2.empty()) {
std::cout << "File 2 = " << file2 << '\n';
}
return 0;
}