replace_copy_if (STL Samples)
在 Visual C++ 演示如何使用 replace_copy_if 标准 (STL)模板库函数。
template<
class ForwardIterator,
class OutputIterator,
class Predicate,
class Type
> inline
OutputIterator replace_copy_if(
ForwardIterator First,
ForwardIterator Last,
OutputIterator Result,
Predicate Pred,
const T& New_Value
)
备注
备注
类/参数名在原型不匹配版本在头文件。修改某些提高可读性。
replace_copy_if 算法将该范围 [First， Last) 的所有元素设置为启动结果中的相同大小调整大小，替换导致谓词为其返回 true 可以在该结果序列的 New_Value 的所有匹配项。 它返回在结果序列中的最后一个新元素之后确定的迭代器。
示例
// replace_copy_if.cpp
// compile with: /EHsc
// Illustrates how to use the replace_copy_if function.
//
// Functions:
// replace_copy_if - Copy the elements of a sequence to another
// same-size sequence replacing any elements
// that satisfies a predicate, with another value.
// disable warning C4786: symbol greater than 255 characters,
// okay to ignore
#pragma warning(disable: 4786)
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
int main()
{
const int MAX_ELEMENTS = 8 ;
// Define a template class vector of integers
typedef vector<int > IntVector ;
//Define an iterator for template class vector of integer
typedef IntVector::iterator IntVectorIt ;
//vector containing numbers
IntVector Numbers(MAX_ELEMENTS), Result(MAX_ELEMENTS) ;
IntVectorIt start, end, it, last, resultIt ;
//Initialize vector Numbers
Numbers[0] = 10 ;
Numbers[1] = 20 ;
Numbers[2] = 10 ;
Numbers[3] = 15 ;
Numbers[4] = 12 ;
Numbers[5] = 7 ;
Numbers[6] = 9 ;
Numbers[7] = 10 ;
start = Numbers.begin() ; // location of first
// element of Numbers
end = Numbers.end() ; // one past the location
// last element of Numbers
resultIt = Result.begin() ; // location of first
// element of Result
// print content of Numbers
cout << "Numbers { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
// copy all elements from Numbers to Result
// replacing any item that >= 10 with 30
last = replace_copy_if(start, end, resultIt,
bind2nd(greater_equal<int>(), 10), 30) ;
//print number of elements copied to Result
cout << "Total number of elements copied to Result = "
<< last - resultIt << endl ;
start = Result.begin() ; // location of first
// element of Result
end = Result.end() ; // one past the location
// last element of Result
// print content of Result
cout << "Result { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
}
Output
Numbers { 10 20 10 15 12 7 9 10 }
Total number of elements copied to Result = 8
Result { 30 30 30 30 30 7 9 30 }
要求
**标题:**algorithm