.TH "std::__is_fast_hash< _Hash >" 3cxx "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
std::__is_fast_hash< _Hash >
.SH SYNOPSIS
.br
.PP
.PP
\fC#include <functional>\fP
.PP
Inherits std::true_type\&.
.SH "Detailed Description"
.PP 

.SS "template<typename _Hash>
.br
struct std::__is_fast_hash< _Hash >"Hint about performance of hash functions\&.
.PP
If a given hash function object is not fast, the hash-based containers will cache the hash code\&. The default behavior is to consider that hashers are fast unless specified otherwise\&.
.PP
Users can specialize this for their own hash functions in order to force caching of hash codes in unordered containers\&. Specializing this trait affects the ABI of the unordered containers, so use it carefully\&. 

.SH "Author"
.PP 
Generated automatically by Doxygen for libstdc++ from the source code\&.