std::wmemcpy
Defined in header <cwchar> | | |
|---|---|---|
wchar_t* wmemcpy( wchar_t* dest, const wchar_t* src, std::size_t count ); | | |
精确复制count所指向的宽字符数组中的连续宽字符。src指向的宽字符数组dest如果对象重叠，则行为未定义。如果count等于零，函数什么也不做。
参数
dest | - | pointer to the wide character array to copy to |
|---|---|---|
src | - | pointer to the wide character array to copy from |
count | - | number of wide characters to copy |
返回值
dest...
注记
此函数%27s模拟字节字符串是std::strncpy，不是std::strcpy...
此函数不区分区域设置，也不注意wchar_t它复制的对象：NULL以及无效字符也被复制。
例
二次
#include <iostream>
#include <cwchar>
#include <clocale>
#include <locale>
int main(void)
{
wchar_t from1[] = L"नमस्ते";
const size_t sz1 = sizeof from1 / sizeof *from1;
wchar_t from2[] = L"Բարև";
const size_t sz2 = sizeof from2 / sizeof *from2;
wchar_t to[sz1 + sz2];
std::wmemcpy(to, from1, sz1); // copy from1, along with its null terminator
std::wmemcpy(to + sz1, from2, sz2); // append from2, along with its null terminator
std::setlocale(LC_ALL, "en_US.utf8");
std::cout.imbue(std::locale("en_US.utf8"));
std::wcout << "Wide array contains: ";
for(size_t n = 0; n < sizeof to / sizeof *to; ++n)
if(to[n])
std::wcout << to[n];
else
std::wcout << "\\0";
std::wcout << '\n';
}二次
可能的产出：
二次
Wide array contains: नमस्ते\0Բարև\0二次
另见
strncpy | copies a certain amount of characters from one string to another (function) |
|---|---|
wmemmove | copies a certain amount of wide characters between two, possibly overlapping, arrays (function) |
c wmemcpy文档
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