er">read_json</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Ptree</span><span class="special">::</span><span class="identifier">key_type</span><span class="special">::</span><span class="identifier">value_type</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</