lass="identifier">os</span><span class="special">,</span> <span class="identifier">json</span><span class="special">::</span><span class="identifier">value</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">jv</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span clas