【STL】 표준 라이브러리 count_if의 예
/*
|| Using a more complex function object
*/
#include <iostream.h>
#include <string>
#include <list>
#include <algorithm>
//predicate function object
class IsAToothbrush
{
public:
IsAToothbrush(string& InToothbrushCode) :
ToothbrushCode(InToothbrushCode) {}
bool operator() (string& SalesRecord)
{
return SalesRecord.substr(0,4)==ToothbrushCode;
}
private:
string ToothbrushCode;
};
int main (void)
{
list<string> SalesRecords;
SalesRecords.push_back("0001 Soap");
SalesRecords.push_back("0002 Shampoo");
SalesRecords.push_back("0003 Toothbrush");
SalesRecords.push_back("0004 Toothpaste");
SalesRecords.push_back("0003 Toothbrush");
string VariableToothbrushCode("0003");
int NumberOfToothbrushes(0);
/*
count_if (SalesRecords.begin(), SalesRecords.end(),
IsAToothbrush(VariableToothbrushCode),
NumberOfToothbrushes);
*/
NumberOfToothbrushes = count_if (SalesRecords.begin(), SalesRecords.end(),
IsAToothbrush(VariableToothbrushCode));
cout << "There were "
<< NumberOfToothbrushes
<< " toothbrushes matching code "
<< VariableToothbrushCode
<< " sold"
<< endl;
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