[#mp_units-operator_plus-01]
= xref:mp_units.adoc[mp_units]::operator+
:relfileprefix: ../
:mrdocs:

Addition operator

== Synopsis

Declared in `<mp‐units/framework/symbol_text.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::size_t N,
    std::size_t M,
    std::size_t N2,
    std::size_t M2>
[[nodiscard]]
constexpr
xref:mp_units/symbol_text-032.adoc[symbol_text<N + N2, M + M2>]
operator+(
    xref:mp_units/symbol_text-032.adoc[symbol_text<N, M>] const& lhs,
    xref:mp_units/symbol_text-032.adoc[symbol_text<N2, M2>] const& rhs);
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:mp_units/symbol_text-032.adoc[symbol_text], declared inside an implementation-defined base class: it can be found only through argument-dependent lookup.
====

== Return Value

A symbol text representation

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The left operand
| *rhs*
| The right operand
|===


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