template<typename ... Args>
static std::string FormatString(const std::string& format, Args ... args)
{
auto size = std::snprintf(nullptr, 0, format.c_str(), args ...) + 1; // Extra space for '\0'
std::unique_ptr<char[]> buf(new char[size]);
std::snprintf(buf.get(), size, format.c_str(), args ...);
return std::string(buf.get(), buf.get() + size - 1); // We don't want the '\0' inside
}
template<typename ... Args>
static std::wstring FormatString(const std::wstring& format, Args ... args)
{
auto size = std::swprintf(nullptr, 0, format.c_str(), args ...) + 1; // Extra space for '\0'
std::unique_ptr<wchar_t[]> buf(new wchar_t[size]);
std::swprintf(buf.get(), size, format.c_str(), args ...);
return std::wstring(buf.get(), buf.get() + size - 1); // We don't want the '\0' inside
}
#define QJFORMAT(fmt,...) FormatString(fmt,__VA_ARGS__)
int main()
{
{
std::string str;
str = QJFORMAT("%d %s", 110, "hello wrold");
printf("%s\n", str.c_str());
}
{
std::wstring str;
str = QJFORMAT(L"%d %s", 110, L"hello wrold");
printf("%ws\n", str.c_str());
}
getchar();
return 0;
}
STL之string 格式化的自我实现
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转载自blog.csdn.net/weixin_56819992/article/details/131043007
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