wstring 转数字 如何将std :: wstring转换为数字类型（int long float）？

What's the best way to convert std::wstring to numeric type, such as int, long, float or double?

解决方案#include

std::wstring s1(L"123");

int num = boost::lexical_cast(s1);

std::wstring s2(L"123.5");

double d = boost::lexical_cast(s2);

These will throw a boost::bad_lexical_cast exception if the string can't be converted.

The other option is to use Boost Qi (a sublibrary of Boost.Spirit):

#include

std::wstring s1(L"123");

int num = 0;

if (boost::spirit::qi::parse(s1.begin(), s1.end(), num))

; // conversion successful

std::wstring s2(L"123.5");

double d = 0;

if (boost::spirit::qi::parse(s1.begin(), s1.end(), d))

; // conversion successful

Using Qi is much faster than lexical_cast but will increase your compile times.