:relfileprefix: ../../../
[#C09F005DE770948FAB82A2FA8F293C22C43C9733]

= Function to_upper

pass:v,q[Return c converted to uppercase]


== Synopsis

Declared in header `</boost/url/grammar/ci_string.hpp#L83[boost/url/grammar/ci_string.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
char
to_upper(char c) noexcept;
----

== Description

pass:v,q[This function returns the character,] pass:v,q[converting it to uppercase if it is]
pass:v,q[lowercase.]
pass:v,q[The function is defined only for]
pass:v,q[low-ASCII characters.]

=== Example
[,cpp]
----
assert( to_upper( 'a' ) == 'A' );
----

=== Exception Safety
pass:v,q[Throws nothing.]



== Return Value

* `char` 


== Parameters

|===
| Name | Type 

| *c*
| `char`

|===