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完成string从istream流上读取输入

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This commit is contained in:
邹晓航
2014-10-12 12:26:43 +08:00
parent 7a66a33901
commit 3f8cc6cbcf
1 changed files with 35 additions and 9 deletions
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44
TinySTL/String.h
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@@ -223,7 +223,7 @@ namespace TinySTL{
}
public:
friend std::ostream& operator <<(std::ostream& os, const string&str);
friend std::istream& operator>> (std::istream& is, string& str);
friend std::istream& operator >> (std::istream& is, string& str);
friend string operator+ (const string& lhs, const string& rhs);
friend string operator+ (const string& lhs, const char* rhs);
friend string operator+ (const char* lhs, const string& rhs);
@@ -589,17 +589,17 @@ namespace TinySTL{
int string::compare_aux(size_t pos, size_t len, const_iterator cit, size_t subpos, size_t sublen)const{
size_t i, j;
for (i = 0, j = 0; i != len && j != sublen; ++i, ++j){
if ((*this)[pos + i] < cit[subpos + j])
return -1;
else if ((*this)[pos + i] > cit[subpos + j])
return 1;
if ((*this)[pos + i] < cit[subpos + j])
return -1;
else if ((*this)[pos + i] > cit[subpos + j])
return 1;
}
if (i == len && j == sublen)
return 0;
return 0;
else if (i == len)
return -1;
else if (j == sublen)
return 1;
return -1;
else
return 1;
}
int string::compare(size_t pos, size_t len, const string& str, size_t subpos, size_t sublen) const{
return compare_aux(pos, len, str.begin(), subpos, sublen);
@@ -696,6 +696,32 @@ namespace TinySTL{
}
return os;
}
std::istream& operator >> (std::istream& is, string& str){
char ch;
string::size_type oldSize = str.size(), index = 0;
bool hasPrevBlank = false, badState = false;
while (is.get(ch)){//<2F><><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD>հ<EFBFBD>
if (isblank(ch) || ch == '\n')
hasPrevBlank = true;
else
break;
}
is.putback(ch);
while (is.get(ch)){
if (ch != EOF && !isblank(ch) && ch != '\n'){
if (++index <= oldSize)
str[index - 1] = ch;
else
str.push_back(ch);
}else{//istream<61><6D>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>
badState = true;
break;
}
}
if (index < oldSize)
str.erase(str.begin() + index, str.end());
return is;
}
string operator+ (const string& lhs, const string& rhs){
string res(lhs);
return res += rhs;