fixed_sequence.hpp

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// nros-cpp: FixedSequence — fixed-capacity sequence container
// Freestanding C++14 — no exceptions, no STL required
//
// Memory layout is repr(C) compatible: identical to { uint32_t size; T data[N]; }.
// Used by codegen-generated message structs for sequence fields.
 
#ifndef NROS_CPP_FIXED_SEQUENCE_HPP
#define NROS_CPP_FIXED_SEQUENCE_HPP
 
#include <cstddef>
#include <cstdint>
 
namespace nros {
 
template <typename T, size_t N> struct FixedSequence {
    uint32_t size;
    T data[N];
 
    FixedSequence() : size(0), data{} {}
 
    bool push_back(const T& val) {
        if (size >= N) return false;
        data[size++] = val;
        return true;
    }
 
    T& operator[](size_t i) { return data[i]; }
    const T& operator[](size_t i) const { return data[i]; }
 
    uint32_t length() const { return size; }
 
    static constexpr size_t max_size() { return N; }
 
    T* begin() { return data; }
    T* end() { return data + size; }
    const T* begin() const { return data; }
    const T* end() const { return data + size; }
};
 
} // namespace nros
 
#endif // NROS_CPP_FIXED_SEQUENCE_HPP