Member Avatar for ambarisha.kn

Hi,

I need some algorithms with syntax to work out logical operations using Standard template library(STLs). Please get me some examples of these or teach me regarding logical operations using STLs.

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Brief, practical STl patterns for logical work — clarifying the gaps in the thread and addressing ’s iota trouble and ’s pointers. Use three common approaches: container-wide tests, element-wise boolean ops, and sequence generation/filling.

Container-wide checks (all/any/none):

#include <vector>
#include <algorithm>

std::vector<bool> flags = {true, true, false};

bool all_true = std::all_of(flags.begin(), flags.end(), [](bool b){ return b; });
bool any_true = std::any_of(flags.begin(), flags.end(), [](bool b){ return b; });
bool none_true = std::none_of(flags.begin(), flags.end(), [](bool b){ return b; });

Element-wise logical operations (AND/OR/XOR/NOT) with std::transform — useful for combining two boolean sequences:

#include <vector>
#include <algorithm>
#include <iterator>

std::vector<bool> a = {true,false,true};
std::vector<bool> b = {false,true,true};
std::vector<bool> out;
out.reserve(a.size());

std::transform(a.begin(), a.end(), b.begin(), std::back_inserter(out),
               [](bool x, bool y){ return x && y; }); // element-wise AND

std::vector<bool> neg;
std::transform(a.begin(), a.end(), std::back_inserter(neg),
               [](bool x){ return !x; }); // NOT

Generating sequences: if std::iota isn’t available, std::generate with a small lambda gives the same result:

#include <vector>
#include <algorithm>

std::vector<int> v(10);
int n = 0;
std::generate(v.begin(), v.end(), [&]{ return n++; }); // fallback to iota

Notes and cautions: prefer lambdas for clarity; std::logical_and (in <functional>) is an alternative when you want a ready-made functor. Be aware of std::vector<bool> specialization (proxy references); for heavy bitwise work prefer std::bitset or a dynamic-bitset library. For reference, see std::all_of, std::transform, std::generate, and std::logical_and.

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Member Avatar for Nick Evan

I'll give you the same link for the third time.
Scroll down for logical operations...:yawn:

(also said it here and here)

Member Avatar for ambarisha.kn

I am not getting with those examples. It looks difficukt to understand and there are no example programs. They have used iota functions which is not working in my system even if i include #include<numeric>. I completed arithmetic operations, relational operations from "C++ standard library A tutorail and reference". But ia m not getting good tutorials for logic operations. Would u please get me some more understandable tutorials with examples

Member Avatar for Nick Evan

Something like this?
[edit] Hmm, that's not a great link after all... Please disregard

Member Avatar for ambarisha.kn

yes. But using STLs.

Member Avatar for Nick Evan

yes. But using STLs.

In that case, I don't know any sites that have clearer examples then the site mentioned in post #1.
Did you look at the examples for logical operations?

Member Avatar for ambarisha.kn

yes i studied those tutorials. Actually i am working on japanese language. Now i got some examples which was in japanese page. I will study these examples. It may helpful for me.

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