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C++ Academy · Lesson

Non-Modifying Algorithms find count all_of

Search and test container contents without changing them.

Non-Modifying Algorithms find count all_of is a free C++ Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the C++ Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Read-Only Operations

Non-modifying algorithms inspect a range without changing it. They live in <algorithm>.

std::find

Locate the first element equal to a value. Returns an iterator — end if not found.

#include <algorithm>
std::vector<int> v = {3, 1, 4, 1, 5};
auto it = std::find(v.begin(), v.end(), 4);
if (it != v.end()) std::cout << "found at " << (it - v.begin());

std::find_if

Find the first element matching a predicate.

auto it = std::find_if(v.begin(), v.end(),
    [](int x) { return x > 3; });

std::find_if_not

The complement of find_if — first element not matching.

std::count and std::count_if

Count occurrences or matching elements. Return ptrdiff_t.

int n = std::count(v.begin(), v.end(), 1);            // count of 1s
int m = std::count_if(v.begin(), v.end(),
    [](int x) { return x > 2; });

std::all_of std::any_of std::none_of

Test a predicate against the range:

  • all_of — every element matches
  • any_of — at least one matches
  • none_of — no element matches
bool allPositive = std::all_of(v.begin(), v.end(),
    [](int x) { return x > 0; });
bool anyEven = std::any_of(v.begin(), v.end(),
    [](int x) { return x % 2 == 0; });

std::equal

Compare two ranges element by element.

std::vector<int> a = {1, 2, 3};
std::vector<int> b = {1, 2, 3};
bool same = std::equal(a.begin(), a.end(), b.begin());

std::mismatch

Find the first pair of elements that differ between two ranges. Returns a pair of iterators.

std::adjacent_find

Find the first pair of adjacent equal elements (or a predicate match).

std::vector<int> v = {1, 2, 2, 3};
auto it = std::adjacent_find(v.begin(), v.end());
std::cout << *it;   // 2

std::min_element std::max_element

Return an iterator to the smallest or largest element. Pass a predicate to compare differently.

auto it = std::max_element(v.begin(), v.end());
std::cout << *it;

std::for_each

Call a function on each element. The function s return value is ignored.

std::for_each(v.begin(), v.end(),
    [](int x) { std::cout << x << " "; });

Ranges Versions (C++20)

C++20 added range overloads that accept a single range instead of two iterators. Cleaner syntax.

#include <ranges>
auto it = std::ranges::find(v, 4);
bool ok = std::ranges::all_of(v, [](int x) { return x > 0; });

Quick Check

Which algorithm returns true only if every element matches a predicate?

Recap

Non-modifying algorithms inspect ranges without changing them: find, count, all_of/any_of/none_of, min_element, equal. C++20 ranges give cleaner single-range syntax.

Frequently asked questions

Is the “Non-Modifying Algorithms find count all_of” lesson free?

Yes — the full text of “Non-Modifying Algorithms find count all_of” is free to read here on the web, and the C++ Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the C++ Academy course, upgrade to CoddyKit PRO.

What will I learn in “Non-Modifying Algorithms find count all_of”?

Search and test container contents without changing them. You practise C++ Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start C++ Academy?

No prior experience is required. C++ Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Non-Modifying Algorithms find count all_of” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this C++ Academy lesson?

Yes. Every C++ Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Non-Modifying Algorithms find count all_of
  2. Modifying transform copy_if replace
  3. Sorting and Partitioning sort stable_partition
  4. Numeric Algorithms accumulate reduce transform_reduce
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