I use \intop from esint package and it behaves different with limits when included in \mathop.
It is declared as:
\re@DeclareMathSymbol{\intop}{\mathop}{largesymbolsA}{'001}
Example:
\documentclass{article}
\usepackage{esint}
\begin{document}
$$ \mathop{\intop}_A^B + \intop_A^B $$
\end{document}
Notice different placement of limits. How can it be done with \mathop and limits placed like without it? I need \mathop for constructing \int with dash, double dash and etc.

\int\limits. See, for instance, http://tex.stackexchange.com/a/211132/4427 – egreg Apr 08 '16 at 12:44\mathopon dash and I putted it on all symbol. Thanks egreg! – Linuxss Apr 08 '16 at 13:34\limts. Example$$\tint\limits_{aaa}^b+\mathop{\tint}\limits_{aaa}^b+ \tint_{aaaa}^b $$. Than you need to put\mathopif you want\limtsand they do not look right. – Linuxss Apr 08 '16 at 13:50\tintis? – egreg Apr 08 '16 at 14:01\tintis from example where you added a link. – Linuxss Apr 11 '16 at 05:29