std::ctype::scan_is
STD：：Ctype：：扫描[医]IS，STD：：Ctype：：do[医]扫描[医]是
| Defined in header | | |
|---|---|---|
| public: const CharT* scan_is( mask m, const CharT* beg, const CharT* end ) const; | (1) | |
| protected: virtual const CharT* do_scan_is( mask m, const CharT* beg, const CharT* end) const; | (2) | |
1%29公共成员函数，调用受保护的虚拟成员函数。do_scan_is最派生的类。
2%29定位字符数组中的第一个字符。[beg, end)满足分类掩码的m，也就是第一个角色c使...is(m, c)会回来true...
参数
| m | - | mask to search for |
|---|---|---|
| beg | - | pointer to the first character in an array of characters to search |
| end | - | one past the end pointer for the array of characters to search |
返回值
中的第一个字符的指针。[beg, end)满足面具，或者end如果没有找到这样的角色。
例
二次
#include <locale>
#include <iostream>
#include <iterator>
int main()
{
auto& f = std::use_facet<std::ctype<char>>(std::locale("")
// skip until the first letter
char s1[] = " \t\t\n Test";
const char* p1 = f.scan_is(std::ctype_base::alpha, std::begin(s1), std::end(s1)
std::cout << "'" << p1 << "'\n";
// skip until the first letter
char s2[] = "123456789abcd";
const char* p2 = f.scan_is(std::ctype_base::alpha, std::begin(s2), std::end(s2)
std::cout << "'" << p2 << "'\n";
}
二次
产出：
二次
'Test'
'abcd'
二次
另见
| do_scan_not virtual | locates the first character in a sequence that fails given classification (virtual protected member function) |
|---|
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