20 template<
typename Iterator>
43 if (
auto p = getConfigParameterOptional<T>(param))
48 error(
"Key <" + param +
"> has not been found");
56 if (
auto p = getConfigParameterOptional<T>(param))
66 std::string
const& param)
const
75 std::string
const& param, T* )
const
79 return p->getValue<T>();
87 std::string
const& param, std::vector<T>* )
const
91 std::istringstream sstr{p->getValue<std::string>()};
92 std::vector<T> result;
96 result.push_back(value);
101 error(
"Value for key <" + param +
"> `" +
103 "' not convertible to a vector of the desired type."
104 " Could not convert token no. " +
105 std::to_string(result.size() + 1) +
".");
109 return std::make_optional(result);
123 auto p =
tree_->equal_range(param);
136 if (
auto p =
tree_->get_child_optional(param))
140 return p->get_value<T>();
142 catch (boost::property_tree::ptree_bad_data
const&)
145 "' not convertible to the desired type.");
150 error(
"Key <" + param +
"> has not been found");
159 if (getConfigParameter<T>(param) != value) {
160 error(
"The value of key <" + param +
"> is not the expected one.");
164 template<
typename Ch>
169 if (getConfigParameter<std::string>(param) != value) {
170 error(
"The value of key <" + param +
"> is not the expected one.");
181 error(
"The data of this subtree has already been read.");
186 if (
auto v =
tree_->get_value_optional<T>())
191 "' is not convertible to the desired type.");
199 if (
auto a = getConfigAttributeOptional<T>(attr))
204 error(
"Did not find XML attribute with name '" + attr +
"'.");
207 template <
typename T>
209 T
const& default_value)
const
211 if (
auto a = getConfigAttributeOptional<T>(attr))
216 return default_value;
219 template <
typename T>
221 std::string
const& attr)
const
224 auto& ct = markVisited<T>(attr,
Attr::ATTR,
true);
226 if (
auto attrs =
tree_->get_child_optional(
"<xmlattr>"))
228 if (
auto a = attrs->get_child_optional(attr)) {
230 if (
auto v = a->get_value_optional<T>()) {
231 return std::make_optional(*v);
233 error(
"Value for XML attribute '" + attr +
"' `" +
235 "' not convertible to the desired type.");
246 bool const peek_only)
const
248 auto const type = std::type_index(
typeid(T));
254 auto& v = p.first->second;
255 if (v.type == type) {
261 error(
"There already was an attempt to obtain key <" + key +
262 "> with type '" + v.type.name() +
"' (now: '" + type.name() +
267 return p.first->second;
T peekConfigParameter(std::string const ¶m) const
bool have_read_data_
Indicates if the plain data contained in this tree has already been read.
void checkConfigParameter(std::string const ¶m, T const &value) const
void checkUniqueAttr(std::string const &attr) const
Asserts that the attribute attr has not been read yet.
std::map< KeyType, CountType > visited_params_
static std::string shortString(std::string const &s)
returns a short string at suitable for error/warning messages
void error(std::string const &message) const
std::optional< ConfigTree > getConfigSubtreeOptional(std::string const &root) const
std::optional< T > getConfigParameterOptional(std::string const ¶m) const
void checkUnique(std::string const &key) const
Asserts that the key has not been read yet.
T getConfigParameter(std::string const ¶m) const
T getConfigAttribute(std::string const &attr) const
Attr
Used to indicate if dealing with XML tags or XML attributes.
CountType & markVisited(std::string const &key, Attr const is_attr, bool peek_only) const
boost::property_tree::ptree const * tree_
The wrapped tree.
std::optional< T > getConfigParameterOptionalImpl(std::string const ¶m, T *) const
Default implementation of reading a value of type T.
Range< ValueIterator< T > > getConfigParameterList(std::string const ¶m) const
std::optional< T > getConfigAttributeOptional(std::string const &attr) const
void checkKeyname(std::string const &key) const
Checks if key complies with the rules [a-z0-9_].
Wraps a pair of iterators for use as a range in range-based for-loops.
Range(Iterator begin, Iterator end)