How to find the size of a character array in c++

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  Map::begin

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  C++
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  C++
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  C++
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  C++
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  Cpp when use size_t

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  C++
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  C++
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  C++
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  Opencv(4.5.1) c:\users\appveyor\appdata\local\temp\1\pip-req-build-kh7iq4w7\opencv\modules\imgproc\src\resize.cpp:4051: error: (-215:assertion failed) !ssize.empty() in function

  C++