### Using Boost.Lambda for Outputting STL Container Elements (C++)

Source: https://www.boost.org/doc/libs/latest/libs/lambda/index

This snippet demonstrates how to use the Boost Lambda Library to define a unary function object for iterating through and printing elements of an STL container separated by spaces. It utilizes placeholders like `_1` to represent function arguments. No external dependencies beyond standard C++ and Boost are required for this basic usage.

```cpp
#include <iostream>
#include <vector>
#include <algorithm>
#include <boost/lambda/lambda.hpp>

int main() {
    std::vector<int> a = {1, 2, 3, 4, 5};
    // Output elements separated by spaces using Boost.Lambda
    std::for_each(a.begin(), a.end(), std::cout << boost::lambda::_1 << ' ');
    std::cout << std::endl;
    return 0;
}
```

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