View source code
Display the source code in std/meta.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Template std.meta.templateAnd

Combines several template predicates using logical AND, i.e. constructs a new predicate which evaluates to true for a given input T if and only if all of the passed predicates are true for T.

template templateAnd(Preds...) ;

The predicates are evaluated from left to right, aborting evaluation in a short-cut manner if a false result is encountered, in which case the latter instantiations do not need to compile.

Example

import std.traits : isNumeric, isUnsigned;

alias storesNegativeNumbers = templateAnd!(isNumeric, templateNot!isUnsigned);
static assert(storesNegativeNumbers!int);
static assert(!storesNegativeNumbers!string && !storesNegativeNumbers!uint);

// An empty sequence of predicates always yields true.
alias alwaysTrue = templateAnd!();
static assert(alwaysTrue!int);

Authors

Walter Bright, David Nadlinger

License

Boost License 1.0.