// Parse foo.toml. If foo.toml is valid, pr.valid() should be true.
// If not valid, pr.errorReason will contain the parser error reason.
std::ifstream ifs("foo.toml");
toml::ParseResult pr = toml::parse(ifs);

if (!pr.valid()) {
    cout << pr.errorReason << endl;
    return;
}

// Note for users from older version:
// Since toml::Parser has a state, I don't recommend to use it directly any more.
// So, I've moved toml::Parser to toml::internal::Parser.
// Using toml::parse() is recommended.

// pr.value is the parsed value.
const toml::Value& v = pr.value;

// You can find a value by find().
// If found, non-null pointer will be returned.
// You can check the type of value with is().
// You can get the inner value by as().
const toml::Value* x = v.find("foo.bar.baz");
if (x && x->is<std::string>()) {
    cout << x->as<string>() << endl;
} else if (x && x->is<int>()) {
    cout << x->as<int>() << endl;
}

// Note: the inner value of integer value is actually int64_t,
// however, you can use 'int' for convenience.
toml::Value* z = ...;
int x = z->as<int>();
int64_t y = z->as<int64_t>();
// toml::Array is actually std::vector<toml::Value>.
// So, you can use range based for, etc.
const toml::Array& ar = z->as<toml::Array>();
for (const toml::Value& v : ar) {
    ...
}

// For convenience way, you can use get() when you're sure that the value exists
// and you know the value type.
// If type error occurred, std::runtime_error is raised.
toml::Value v = ...;
cout << v.get<string>("foo.bar") << endl;

// For array type, you can also use get<std::vector<int>>() etc.
// Note that a fresh vector<int> is allocated.
std::vector<int> vs = v.get<std::vector<int>>();

// If you need to check value existence or type, you should use find().