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removed dangling reference to NEGATORS

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Frank B. Brokken 2017-06-04 12:04:11 +02:00
parent 5af28beb5f
commit 4a5ac38e6a
2 changed files with 10 additions and 19 deletions
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1
annotations/yo/classtemplates/examples/notfn.cc
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@ -1,5 +1,6 @@
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <algorithm>

28
annotations/yo/classtemplates/notfn.yo
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@ -1,25 +1,15 @@
Section ref(NEGATORS) covered the tt(not1) and tt(not2) negators. These
negators cannot always be used in combination with the tt(bind) function
template, and there use is limited to situations where one or two arguments
are used. It is likely that in the upcoming i(C++17) standard they will either
be deprecated or they will be augmented with a more generic negator, for which
the name ti(not_fn) has been coined.
A emi(negator) is a function object toggling the truth value of
a function that's called from the negator: if the function returns tt(true)
the negator returns tt(false) and vv.
It is likely that in the upcoming i(C++17) standard a generic negator, for
which the name ti(not_fn) has been coined, will be made available.
In this section we'll have a look at a possible bare bones implementation of
such a tt(not_fn) negator.
such a tt(not_fn) negator, using it in combination with the (deprecated)
tt(std::bind) function object.
Let's first have a look at how tt(not_fn) can be used. When discussing the
negators it was noted that the second of the following two statements won't
compile:
verb(
count_if(vs.begin(), vs.end(),
bind(not2(greater_equal<string>()), _1, reftext));
count_if(vs.begin(), vs.end(),
not1(bind(greater_equal<string>()), _1, reftext));
)
Here we'll develop an alternative, tt(not_fn), replacing tt(not1) and
tt(not2) in the above statements:
Here's how tt(not_fn) can be used in practice:
verb(
count_if(vs.begin(), vs.end(), // 1
bind(not_fn(greater_equal<string>()), _1, reftext));