This post is about some C++ code snippets that might be useful when doing online assessment (and this post might continue to grow). Sometimes we just couldn’t remember how to do a certain operation and can’t access StackOverflow for quick answers. I definitely learned this the hard way.
Or we possibility should do our online assessment in Python to avoid these sort of problems.
Splitting a string using string delimiter
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std::string str = "The sentence to be split";
std::string delimiter = " ";
std::vector<std::string> result;
size_t pos = 0;
std::string token;
while((pos = str.find(delimiter)) != std::string::npos) {
token = str.substr(0, pos);
result.push_back(token);
str.erase(0, pos + delimiter.length());
}
result.push_back(str);
Another method using stringstream:
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std::string str = "The sentence to be split";
std::stringstream ss(str);
std::vector<std::string> result;
std::string token;
while (ss >> token) {
result.push_back(token);
}
CUDA Error Handling Macro
Not actually C++ code, but could be fitted else where. Saw this trick from CUDA-By-Example.
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static void HandleError(cudaError_t err, const char *file, int line) {
if (err != cudaSuccess) {
printf("%s in %s at line %d/n", cudaGetErrorString(err), file, line);
exit(EXIT_FAILURE);
}
}
#define HANDLE_ERROR( err ) (HandleError (err, __FILE__, __LINE__))
Then use the macro HANDLE_ERROR as follow:
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HANDLE_ERROR( cudaMemcpy(dev_a, a, N * sizeof(int), cudaMemcpyHostToDevice) );