optional_scalar.cc

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#include "goptions.h"
 
#include <optional>
#include <string>
 
namespace {
 
GOptions defineOptions() {
    GOptions options;
    options.defineOption(
        GVariable("optional_string", std::nullopt, "optional string used by this test"),
        "An unset value must be returned as std::nullopt.");
    options.defineOption(
        GVariable("optional_int", std::nullopt, "optional integer used by this test"),
        "An unset value must be returned as std::nullopt.");
    options.defineOption(GVariable("required_string", "configured", "required string used by this test"), "");
    options.defineOption(GVariable("required_int", 7, "required integer used by this test"), "");
    options.defineOption(GVariable("required_double", 1.5, "required double used by this test"), "");
    return options;
}
 
} // namespace
 
int main(int argc, char* argv[]) {
    std::optional<std::string> expected;
    std::optional<int> expectedInt;
    const std::string option_prefix = "-optional_string=";
    const std::string int_option_prefix = "-optional_int=";
    for (int index = 1; index < argc; ++index) {
        const std::string argument = argv[index];
        if (argument.rfind(option_prefix, 0) == 0) {
            expected = argument.substr(option_prefix.size());
        }
        if (argument.rfind(int_option_prefix, 0) == 0) {
            expectedInt = std::stoi(argument.substr(int_option_prefix.size()));
        }
    }
 
    GOptions options(argc, argv, defineOptions());
    const auto value = options.getOptionalScalarString("optional_string");
    const auto intValue = options.getOptionalScalarInt("optional_int");
    if (options.getRequiredScalarString("required_string") != "configured" ||
        options.getRequiredScalarInt("required_int") != 7 ||
        options.getRequiredScalarDouble("required_double") != 1.5) {
        return 1;
    }
 
    if (expected) {
        if (!value || *value != *expected) return 1;
    }
    else if (value) return 1;
    return intValue == expectedInt ? 0 : 1;
}