OutputIterators.h

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#pragma once
 
 
#include "common/Assert.h"
 
NAMESPACE_SPH_BEGIN
 
class NullInserter {
public:
    NullInserter& operator*() {
        return *this;
    }
 
    NullInserter& operator++() {
        return *this;
    }
 
    template <typename TValue>
    NullInserter& operator=(TValue&&) {
        return *this;
    }
 
    using iterator_category = std::output_iterator_tag;
    using value_type = void;
    using difference_type = ptrdiff_t;
    using pointer = void;
    using reference = void;
};
 
template <typename TContainer>
class BackInserter {
private:
    TContainer& container;
 
public:
    explicit BackInserter(TContainer& container)
        : container(container) {}
 
    BackInserter& operator*() {
        return *this;
    }
 
    BackInserter& operator++() {
        return *this;
    }
 
    template <typename TValue>
    BackInserter& operator=(TValue&& value) {
        container.push(std::forward<TValue>(value));
        return *this;
    }
 
    using iterator_category = std::output_iterator_tag;
    using value_type = void;
    using difference_type = ptrdiff_t;
    using pointer = void;
    using reference = void;
};
 
template <typename TContainer>
BackInserter<TContainer> backInserter(TContainer& c) {
    return BackInserter<TContainer>(c);
}
 
NAMESPACE_SPH_END