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  4. IDE\VC\Tools\MSVC\14.36.32532\include\algorithm:7931: error: C2678: 二进制“=”: 没有找到接受“const T”类型的左操作数的运算符(或没有可接受的转换)
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IDE\VC\Tools\MSVC\14.36.32532\include\algorithm:7931: error: C2678: 二进制“=”: 没有找到接受“const T”类型的左操作数的运算符(或没有可接受的转换)

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  • L Offline
    L Offline
    Lunaw
    wrote on last edited by Lunaw
    #1

    我在QtCreate中编译qtwebengine的时候,出现错误“二进制=:没有找到const T类型的做操作数的运算符(或没有可接受的转换)”,代码如下:

    algorithm
    template <class _BidIt, class _Pr>
                
                _CONSTEXPR20 _BidIt _Insertion_sort_unchecked(const _BidIt _First, const _BidIt _Last, _Pr _Pred) {
                
                    // insertion sort [_First, _Last)
                
                    if (_First != _Last) {
                
                        for (_BidIt _Mid = _First; ++_Mid != _Last;) { // order next element
                
                            _BidIt _Hole               = _Mid;
                
                            _Iter_value_t<_BidIt> _Val = _STD move(*_Mid);
                
                
                
                            if (_DEBUG_LT_PRED(_Pred, _Val, *_First)) { // found new earliest element, move to front
                
                                _Move_backward_unchecked(_First, _Mid, ++_Hole);
                
                                //*_First = _STD move(_Val);
                
                            } else { // look for insertion point after first
                
                                for (_BidIt _Prev = _Hole; _DEBUG_LT_PRED(_Pred, _Val, *--_Prev); _Hole = _Prev) {
                
                                    *_Hole = _STD move(*_Prev); // move hole down
                
                                }
                
                
                
                                *_Hole = _STD move(_Val); // insert element in hole
                
                            }
                
                        }
                
                    }
                
                
                
                    return _Last;
                
                }           } else { // look for insertion point after first
                    for (_BidIt _Prev = _Hole; _DEBUG_LT_PRED(_Pred, _Val, *--_Prev); _Hole = _Prev) {
                        *_Hole = _STD move(*_Prev); // move hole down
                    }
    
                    *_Hole = _STD move(_Val); // insert element in hole
                }
    

    QtCreate列出的报错信息:

    IDE\VC\Tools\MSVC\14.36.32532\include\algorithm(7931): error C2678: 二进制“=”: 没有找到接受“const T”类型的左操作数的运算符(或没有可接受的转换)
            with
            [
                T=perfetto::trace_processor::TimestampedTracePiece
            ]
    C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\perfetto\src/trace_processor/timestamped_trace_piece.h(256): note: 可能是“perfetto::trace_processor::TimestampedTracePiece &perfetto::trace_processor::TimestampedTracePiece::operator =(const perfetto::trace_processor::TimestampedTracePiece &)”
    C:\Qt\5.15.2\Src\qtwebengine\src\3rdparty\chromium\third_party\perfetto\src/trace_processor/timestamped_trace_piece.h(191): note: 或    “perfetto::trace_processor::TimestampedTracePiece &perfetto::trace_processor::TimestampedTracePiece::operator =(perfetto::trace_processor::TimestampedTracePiece &&)”
    D:\vs2019\IDE\VC\Tools\MSVC\14.36.32532\include\algorithm(7931): note: 尝试匹配参数列表“(const T, perfetto::trace_processor::TimestampedTracePiece)”时
            with
            [
                T=perfetto::trace_processor::TimestampedTracePiece
            ]
    D:\vs2019\IDE\VC\Tools\MSVC\14.36.32532\include\algorithm(8053): note: 查看对正在编译的函数 模板 实例化“_BidIt std::_Insertion_sort_unchecked<_RanIt,_Pr>(const _BidIt,const _BidIt,_Pr)”的引用
            with
            [
                _BidIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _RanIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _Pr=std::less<void>
            ]
    D:\vs2019\IDE\VC\Tools\MSVC\14.36.32532\include\algorithm(8083): note: 查看对正在编译的函数 模板 实例化“void std::_Sort_unchecked<_FwdIt,_Fn>(_RanIt,_RanIt,__int64,_Pr)”的引用
            with
            [
                _FwdIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _Fn=std::less<void>,
                _RanIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _Pr=std::less<void>
            ]
    D:\vs2019\IDE\VC\Tools\MSVC\14.36.32532\include\algorithm(8088): note: 查看对正在编译的函数 模板 实例化“void std::sort<_RanIt,std::less<void>>(const _RanIt,const _RanIt,_Pr)”的引用
            with
            [
                _RanIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _Pr=std::less<void>
            ]
    ../../../../../Src/qtwebengine/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/trace_sorter.cc(51): note: 查看对正在编译的函数 模板 实例化“void std::sort<_FwdIt>(const _RanIt,const _RanIt)”的引用
            with
            [
                _FwdIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator,
                _RanIt=perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator
            ]
    
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    • SGaistS SGaist moved this topic from QtWebEngine on
    • X Offline
      X Offline
      xlc1234
      wrote on last edited by
      #2

      老哥 你解决了吗 我也遇到了

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