AttributedFunction

Entry point for funcattr API.

Helper struct that takes care of calling given Function in a such way that part of its arguments are evalutated by attached input attributes (see before) and output gets post-processed by output attribute (see after).

One such structure embeds single attributed function to call and specific argument type list that can be passed to attached functions.

struct AttributedFunction (

alias Function

alias StoredArgTypes

) {

import std.traits : isSomeFunction, ReturnType, FunctionTypeOf, ParameterTypeTuple, ParameterIdentifierTuple;;

import vson.meta.typetuple : Group, isGroup, Compare;;

import std.functional : toDelegate;;

import std.typetuple : Filter;;

void storeArgs(StoredArgTypes.expand args);

ReturnType!Function opCall(FunctionDg dg, T args);

ReturnType!Function opCall(T args);

}

Members

Functions

opCall ReturnType!Function opCall(T args): Convenience wrapper tha creates stub delegate for free functions.
opCall ReturnType!Function opCall(FunctionDg dg, T args): Used to invoke configured function/method with all attached attribute functions.
storeArgs void storeArgs(StoredArgTypes.expand args): Stores argument tuple for attached function calls

Parameters

Function: attributed function
StoredArgTypes: Group of argument types for attached functions

Examples

example

import std.conv;

static string evaluator(string left, string right)
{
	return left ~ right;
}

// all attribute function must accept same stored parameters
static int modificator(int result, string unused1, string unused2)
{
	return result * 2;
}

@before!evaluator("a") @before!evaluator("c") @after!modificator()
static int sum(string a, int b, string c, double d)
{
	return to!int(a) + to!int(b) + to!int(c) + to!int(d);
}

// ("10", "20") - stored arguments for evaluator()
auto funcattr = createAttributedFunction!sum("10", "20");

// `b` and `d` are unattributed, thus `42` and `13.5` will be
// used as their values
int result = funcattr(42, 13.5);

assert(result == (1020 + 42 + 1020 + to!int(13.5)) * 2);

AttributedFunction

Members

Functions

Parameters

Examples

Meta

Source