85 lines
1.5 KiB
C++
85 lines
1.5 KiB
C++
#include "serialise.hh"
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namespace rust {
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// Depending on the internal representation of Rust slices is slightly
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// evil...
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template<typename T>
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struct Slice
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{
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T * ptr;
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size_t size;
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Slice(T * ptr, size_t size) : ptr(ptr), size(size)
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{
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assert(ptr);
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}
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};
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struct StringSlice : Slice<char>
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{
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StringSlice(const std::string & s): Slice((char *) s.data(), s.size()) {}
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};
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struct Source
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{
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size_t (*fun)(void * source_this, rust::Slice<uint8_t> data);
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nix::Source * _this;
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Source(nix::Source & _this)
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: fun(sourceWrapper), _this(&_this)
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{}
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// FIXME: how to propagate exceptions?
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static size_t sourceWrapper(void * _this, rust::Slice<uint8_t> data)
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{
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auto n = ((nix::Source *) _this)->read(data.ptr, data.size);
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return n;
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}
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};
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/* C++ representation of Rust's Result<T, CppException>. */
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template<typename T>
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struct Result
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{
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unsigned int tag;
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union {
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T data;
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std::exception_ptr * exc;
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};
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/* Rethrow the wrapped exception or return the wrapped value. */
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T unwrap()
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{
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if (tag == 0)
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return data;
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else if (tag == 1)
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std::rethrow_exception(*exc);
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else
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abort();
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}
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};
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template<typename T>
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struct CBox
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{
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T * ptr;
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T * operator ->()
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{
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return ptr;
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}
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CBox(T * ptr) : ptr(ptr) { }
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CBox(const CBox &) = delete;
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CBox(CBox &&) = delete;
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~CBox()
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{
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free(ptr);
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}
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};
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}
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