map.hpp

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#ifndef _C4_YML_STD_MAP_HPP_
#define _C4_YML_STD_MAP_HPP_
 
/** @file map.hpp write/read std::map to/from a YAML tree. */
 
#include "c4/yml/node.hpp"
#include <map>
 
namespace c4 {
namespace yml {
 
// std::map requires child nodes in the data
// tree hierarchy (a MAP node in ryml parlance).
// So it should be serialized via write()/read().
 
template<class K, class V, class Less, class Alloc>
void write(c4::yml::NodeRef *n, std::map<K, V, Less, Alloc> const& m)
{
    *n |= c4::yml::MAP;
    for(auto const& C4_RESTRICT p : m)
    {
        auto ch = n->append_child();
        ch << c4::yml::key(p.first);
        ch << p.second;
    }
}
 
/** read the node members, assigning into the existing map. If a key
 * is already present in the map, then its value will be
 * move-assigned. */
template<class K, class V, class Less, class Alloc>
bool read(c4::yml::ConstNodeRef const& n, std::map<K, V, Less, Alloc> * m)
{
    for(auto const& C4_RESTRICT ch : n)
    {
        K k{};
        ch >> c4::yml::key(k);
        ch >> (*m)[k];
    }
    return true;
}
 
} // namespace yml
} // namespace c4
 
#endif // _C4_YML_STD_MAP_HPP_