Wrapper for references to array in C++.
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Wrapper for Reference to Array

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References to array are very common in C++ programs. In good old C programs, references to array are represented as a pointer and its length like void f(int const* ptr, size_t const len). In C++, references to array are represented using template parameter like template<size_t N> void f(int (&arr)[N]). And C++ has many useful array classes like std::array, std::vector and so on. array_view can deal all of them with safe and unified way.

#include <iostream>
#include "array_view.hpp"

void show_int_array(arv::array_view<int> view)
    std::cout << '{';
    if (!view.empty()) {
        auto itr = view.begin();
        auto const end = view.end();
        while (true) {
            std::cout << *itr;
            if (++itr != end) {
                std::cout << ", ";
            } else {
    std::cout << "}\n";

int main()
    int good_old_c_array[] = {1, 2, 3, 4};
    std::array<int, 4> array = {{1, 2, 3, 4}};
    std::vector<int> vector = {1, 2, 3, 4};

    // access arrays with safe and unified way
    show_int_array({1, 2, 3, 4});
    show_int_array({&good_old_c_array[0], 4});

    return 0;


Copy files in include/ to a directory in include paths.

$ cp include/* path/to/include-dir/

More Usage

When you want to use array_view explicitly, use make_view().

std::vector<int> v = {1, 2, 3};
auto av = arv::make_view(v);

If you want to output array_view, include array_view_output.hpp and just use <<.

#include "array_view_output.hpp"
std::vector<int> v = {1, 2, 3, 4, 5};
std::cout << arv::make_view(v); // "{1, 2, 3, 4, 5}" is output

You can slice array_view to make new sub-array references.

std::vector<int> v = {1, 2, 3, 4, 5};
auto av = arv::make_view(v);
auto sub_av = av.slice(/*position*/ 2, /*length*/ 2);
std::cout << sub_av; // {3, 4}
auto sub_av2 = av.slice(arv::check_bound, /*position*/ 2, /*length*/ 2); // check boundary and may throw an exception
std::cout << sub_av2; // {3, 4}

Why don't you use boost::range?

I use this library in my job. Just try to feel what I feel.


This library is distributed under NYSL.

A. This software is "Everyone'sWare". It means: Anybody who has this software can use it as if he/she is the author.

A-1. Freeware. No fee is required. A-2. You can freely redistribute this software. A-3. You can freely modify this software. And the source may be used in any software with no limitation. A-4. When you release a modified version to public, you must publish it with your name.

B. The author is not responsible for any kind of damages or loss while using or misusing this software, which is distributed "AS IS". No warranty of any kind is expressed or implied. You use AT YOUR OWN RISK.

C. Copyrighted to (.......)

D. Above three clauses are applied both to source and binary form of this software.