[#tinyformat-FormatStringCheck]
= xref:tinyformat.adoc[tinyformat]::FormatStringCheck
:relfileprefix: ../
:mrdocs:

Format string wrapper that checks the format at compile time.

== Synopsis

Declared in `<tinyformat.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<unsigned int num_params>
struct FormatStringCheck;
----

== Description

Added for Bitcoin Core. Unlike ConstevalFormatString this supports RuntimeFormat‐wrapped std::string for runtime string formatting without compile time checks.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:tinyformat/FormatStringCheck/2constructor-02.adoc[`FormatStringCheck`]         [.small]#[constructor]#
| Constructors
| xref:tinyformat/FormatStringCheck/2conversion.adoc[`operator char const*`] 
| Access the underlying format string.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:tinyformat/FormatStringCheck/fmt.adoc[`fmt`] 
| Validated null‐terminated format string.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:tinyformat/format-02.adoc[`format`]
| Format list of arguments according to the given format string and return the result as a string.
| xref:tinyformat/printf.adoc[`printf`]
| Format list of arguments to std::cout, according to the given format string
| xref:tinyformat/printfln.adoc[`printfln`]
| Format list of arguments to std::cout, then append a newline.
|===


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