7.2 KiB
[string.conversions]
27 Strings library [strings]
27.4 String classes [string.classes]
27.4.5 Numeric conversions [string.conversions]
int stoi(const string& str, size_t* idx = nullptr, int base = 10); long stol(const string& str, size_t* idx = nullptr, int base = 10); unsigned long stoul(const string& str, size_t* idx = nullptr, int base = 10); long long stoll(const string& str, size_t* idx = nullptr, int base = 10); unsigned long long stoull(const string& str, size_t* idx = nullptr, int base = 10);
Effects: The first two functions call strtol(str.c_str(), ptr, base), and the last three functions call strtoul(str.c_str(), ptr, base),strtoll(str.c_str(), ptr, base), and strtoull(str.c_str(), ptr, base), respectively.
Each function returns the converted result, if any.
The argument ptr designates a pointer to an object internal to the function that is used to determine what to store at *idx.
If the function does not throw an exception and idx != nullptr, the function stores in *idx the index of the first unconverted element of str.
Returns: The converted result.
Throws: invalid_argument if strtol, strtoul,strtoll, or strtoull reports that no conversion can be performed.
Throws out_of_range if strtol, strtoul,strtoll or strtoull sets errno to ERANGE, or if the converted value is outside the range of representable values for the return type.
float stof(const string& str, size_t* idx = nullptr); double stod(const string& str, size_t* idx = nullptr); long double stold(const string& str, size_t* idx = nullptr);
Effects: These functions callstrtof(str.c_str(), ptr), strtod(str.c_str(), ptr), andstrtold(str.c_str(), ptr), respectively.
Each function returns the converted result, if any.
The argument ptr designates a pointer to an object internal to the function that is used to determine what to store at*idx.
If the function does not throw an exception and idx != nullptr, the function stores in *idx the index of the first unconverted element of str.
Returns: The converted result.
Throws: invalid_argument if strtof, strtod, orstrtold reports that no conversion can be performed.
Throwsout_of_range if strtof, strtod, orstrtold sets errno to ERANGE or if the converted value is outside the range of representable values for the return type.
string to_string(int val); string to_string(unsigned val); string to_string(long val); string to_string(unsigned long val); string to_string(long long val); string to_string(unsigned long long val); string to_string(float val); string to_string(double val); string to_string(long double val);
Returns: format("{}", val).
int stoi(const wstring& str, size_t* idx = nullptr, int base = 10); long stol(const wstring& str, size_t* idx = nullptr, int base = 10); unsigned long stoul(const wstring& str, size_t* idx = nullptr, int base = 10); long long stoll(const wstring& str, size_t* idx = nullptr, int base = 10); unsigned long long stoull(const wstring& str, size_t* idx = nullptr, int base = 10);
Effects: The first two functions call wcstol(str.c_str(), ptr, base), and the last three functions call wcstoul(str.c_str(), ptr, base),wcstoll(str.c_str(), ptr, base), and wcstoull(str.c_str(), ptr, base), respectively.
Each function returns the converted result, if any.
The argument ptr designates a pointer to an object internal to the function that is used to determine what to store at *idx.
If the function does not throw an exception and idx != nullptr, the function stores in *idx the index of the first unconverted element of str.
Returns: The converted result.
Throws: invalid_argument if wcstol, wcstoul, wcstoll, orwcstoull reports that no conversion can be performed.
Throwsout_of_range if the converted value is outside the range of representable values for the return type.
float stof(const wstring& str, size_t* idx = nullptr); double stod(const wstring& str, size_t* idx = nullptr); long double stold(const wstring& str, size_t* idx = nullptr);
Effects: These functions call wcstof(str.c_str(), ptr),wcstod(str.c_str(), ptr), and wcstold(str.c_str(), ptr), respectively.
Each function returns the converted result, if any.
The argument ptr designates a pointer to an object internal to the function that is used to determine what to store at *idx.
If the function does not throw an exception and idx != nullptr, the function stores in *idx the index of the first unconverted element of str.
Returns: The converted result.
Throws: invalid_argument if wcstof, wcstod, or wcstold reports that no conversion can be performed.
Throws out_of_range if wcstof, wcstod, orwcstold sets errno to ERANGE.
wstring to_wstring(int val); wstring to_wstring(unsigned val); wstring to_wstring(long val); wstring to_wstring(unsigned long val); wstring to_wstring(long long val); wstring to_wstring(unsigned long long val); wstring to_wstring(float val); wstring to_wstring(double val); wstring to_wstring(long double val);
Returns: format(L"{}", val).