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tagfile: Support mapped containers, similar to a sparse array

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Note: This now treats vector<pair> as a mapped container as well – an ordered multimap, so to speak
This commit is contained in:
Celtic Minstrel
2023-01-16 01:17:00 -05:00
parent 50d611e319
commit 99bd1678e4
2 changed files with 55 additions and 2 deletions
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35
src/fileio/tagfile.hpp
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@@ -44,6 +44,12 @@ namespace detail {
template<>
struct is_container<std::string> : std::false_type {};
template<typename T>
struct is_pair : public std::false_type {};
template<typename A, typename B>
struct is_pair<std::pair<A, B>> : public std::true_type {};
}
class cTagFile;
@@ -286,7 +292,8 @@ public:
}
}
template<typename Container>
void extractSparse(Container& values, typename Container::value_type def = typename Container::value_type()) const {
typename std::enable_if<!detail::is_pair<typename Container::value_type>::value>::type
extractSparse(Container& values, typename Container::value_type def = typename Container::value_type()) const {
using T = typename Container::value_type;
values.clear();
for(size_t n = 0; n < tags.size(); n++) {
@@ -298,7 +305,8 @@ public:
}
}
template<typename Container>
void encodeSparse(const Container& values, typename Container::value_type def = typename Container::value_type()) {
typename std::enable_if<!detail::is_pair<typename Container::value_type>::value>::type
encodeSparse(const Container& values, typename Container::value_type def = typename Container::value_type()) {
size_t i = 0;
for(const auto& value : values) {
if(value != def) {
@@ -307,6 +315,29 @@ public:
i++;
}
}
template<typename Container>
typename std::enable_if<detail::is_pair<typename Container::value_type>::value>::type
extractSparse(Container& values) const {
using T = std::pair<
typename std::remove_cv<typename Container::value_type::first_type>::type,
typename Container::value_type::second_type
>;
values.clear();
for(size_t n = 0; n < tags.size(); n++) {
T value;
*this >> value.first >> value.second;
values.insert(value);
}
}
template<typename Container>
typename std::enable_if<detail::is_pair<typename Container::value_type>::value>::type
encodeSparse(const Container& values, typename Container::value_type::second_type def = typename Container::value_type::second_type()) {
for(const auto& value : values) {
if(value.second != def) {
*this << value.first << value.second;
}
}
}
template<typename T>
void extract(vector2d<T>& values) const {
values.resize(0, tags.size());