buffer_pool.hpp

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#ifndef EAGINE_MEMORY_BUFFER_POOL_HPP
#define EAGINE_MEMORY_BUFFER_POOL_HPP
 
#include "buffer.hpp"
#include <algorithm>
#include <vector>
 
namespace eagine::memory {
//------------------------------------------------------------------------------
class buffer_pool {
public:
    auto get(span_size_t req_size = 0) -> memory::buffer {
        auto pos = std::lower_bound(
          _pool.begin(), _pool.end(), req_size, [](auto& buf, auto req) {
              return buf.capacity() < req;
          });
        if(pos != _pool.end()) {
            memory::buffer result{std::move(*pos)};
            _pool.erase(pos);
            result.resize(req_size);
            return result;
        }
        memory::buffer result{};
        result.resize(req_size);
        return result;
    }
 
    void eat(memory::buffer used) {
        auto pos = std::lower_bound(
          _pool.begin(),
          _pool.end(),
          used.capacity(),
          [](auto& buf, auto capacity) { return buf.capacity() < capacity; });
        _pool.emplace(pos, std::move(used));
    }
 
private:
    std::vector<memory::buffer> _pool;
};
//------------------------------------------------------------------------------
} // namespace eagine::memory
 
#endif // EAGINE_MEMORY_BUFFER_POOL_HPP