代码语言:txt 复制 #include <iostream> #include <vector> #include <memory> #include <cstring> int main() { int data[] = {1, 2, 3, 4, 5}; size_t size = sizeof(data); // 使用memcpy将数据拷贝到临时内存块 std::unique_ptr<int[]>
它们都起作用了。data()方法是正确的方法。如果它不工作-检查数据是否以某种方式损坏。
intmain(){ vector<int> vec; vector<int> vec1; vec.push_back(10); vec.push_back(100); vec1.resize(vec.size());memcpy(vec1.data(),vec.data(),vec.size() *sizeof(int));for(vector<int>::iterator it = vec1.begin();it != vec1.end();it++) { cout << *it; }charmyname[...
vector<float> fData (1000, 0); // Create 1000 random values for (int i = 0; i < fData.size(); i++) { fData[i] = rand() % 1001; } for (int j = 0; j < fData.size(); j++) { fMessage.add_samples(fData[j]); } return 0; } 但我想使用 memcpy 之类的方法来加速复...
对象应该是POD类型,即只包含基本数据类型(如int、float等)和POD类型的组合,且不应该包含指向动态分配内存的指针(如std::string、std::vector等)。 确定对象的大小: 使用sizeof运算符来确定对象的大小,这是memcpy函数需要复制的字节数。 调用memcpy函数: 传入目标地址、源地址和对象大小。确保目标内存已经分配,并且大...
memcpy(vec1.data(),vec.data(),vec.size() * sizeof(int)); for (vector<int>::iterator it = vec1.begin();it != vec1.end();it++) { cout << *it; } char myname[] = "Pierre dee Fermat"; memcpy(,myname,strlen(myname) + 1); ...
void*pData = malloc(sizeof(double)*xsize*ysize*1/8); memset(pData,0x00,sizeof(double)*szize*ysize*1/8); .../*do something and give some values to some pixels*/... std::vector<double> resultVec(xsize*ysize); memcpy((void*)&resultVec[0],pData,sizeof(double)*xsize*ysize...
memcpy(vec1.data(),vec.data(),vec.size() * sizeof(int));for (vector<int>::iterator it = vec1.begin();it != vec1.end();it++){ cout << *it;} char myname[] = "Pierre dee Fermat";memcpy(person.name,myname,strlen(myname) + 1);person.age = 46;cout << person.name << ...
Dependencies To enable this parameter, select theUse memcpy for vector assignmentcheck box. Settings 64 | positive integer Minimum size, in bytes, for thememcpyormemsetoptimization, specified as a positive integer. The default value for this setting is 64. ...
In the Code Generation Settings dialog box, clear theUse memcpy for vector assignmentcheck box. When thememcpyoptimization is enabled, the use ofmemcpydepends on the number of bytes to copy. The number of bytes to copy is the number of array elements multiplied by the number of bytes required...