streambuf读优模板
encore
2019-03-20 21:10:00
rt，有bug可以评论或者以任何形式@我
常数还可以再优化，这里主要是提供一个思路。
已知可能是bug的：
* 控制台下调试可能需要多摁几下ctrl+Z，freopen之类无影响。
希望有大佬可以帮忙解决。
【190327更新】
* 新增redc，redst分别用于读入字符，字符串。暂不支持std::string。
主要是为了解决字符和数字混搭的题目的要求。
```cpp
namespace IO{
using std::cin;
using std::cout;
using std::endl;
namespace IN {
#define getc() (p1 == p2 && (p2 = (p1 = buf) + inbuf -> sgetn(buf, MAX_INPUT), p1 == p2) ? EOF : *p1++)
const int MAX_INPUT = 1000000;
char buf[MAX_INPUT], *p1, *p2;
template <typename T>
inline int
redi(T &x) {
static std::streambuf *inbuf = cin.rdbuf();
x = 0;
register int f = 0, flag = 1;
register char ch = getc();
if (ch == EOF) return EOF;
while (!std::isdigit(ch)) {
if (ch == '-') f = 1;
ch = getc();
}
if (std::isdigit(ch)) x = x * 10 + ch - '0', ch = getc(), flag = 0;
while (std::isdigit(ch)) {
x = x * 10 + ch - 48;
ch = getc();
}
x = f ? -x : x ;
return ch == EOF ? EOF : flag;
}
template <typename T,typename ...Args>
inline int
redi(T& a,Args& ...args) {
if (redi(a) != EOF) {
redi(args...);
return 0;
}
else return EOF;
}
inline int
redc(char &ch) {
static std::streambuf *inbuf = cin.rdbuf();
return (ch = getc()) == EOF ? EOF : 0;
}
inline int
redst(char *st) {
if (redc(*st) != EOF && (*st)) while (redc(*(++ st)) != EOF);
else return EOF;
return 0;
}
#undef getc
}
namespace OUT {
template <typename T>
inline void
put(T x) {
static std::streambuf *outbuf = cout.rdbuf();
static char stack[21];
static int top = 0;
if (x < 0) {
outbuf -> sputc('-');
x=-x;
}
if (!x) {
outbuf -> sputc('0');
outbuf -> sputc('\n');
return;
}
while (x) {
stack[++top] = x % 10 + '0';
x /= 10;
}
while (top) {
outbuf -> sputc(stack[top]);
-- top;
}
outbuf -> sputc('\n');
}
inline void
putc (const char ch) {
static std::streambuf *outbuf = cout.rdbuf();
outbuf -> sputc(ch);
}
template<typename T>
inline void
put_non(T x)
{
static std::streambuf *outbuf = cout.rdbuf();
static char stack[21];
static int top = 0;
if (x < 0) {
outbuf -> sputc('-');
x=-x;
}
if (!x) {
outbuf -> sputc('0');
return;
}
while (x) {
stack[++top] = x % 10 + '0';
x /= 10;
}
while (top) {
outbuf -> sputc(stack[top]);
--top;
}
}
template <typename T>
inline void
put(const char ch,T x)
{
static std::streambuf *outbuf = cout.rdbuf();
static char stack[21];
static int top = 0;
if (x < 0) {
outbuf -> sputc('-');
x=-x;
}
if (!x) {
outbuf -> sputc('0');
outbuf -> sputc(ch);
return;
}
while (x) {
stack[++top] = x % 10 + '0';
x /= 10;
}
while (top) {
outbuf -> sputc(stack[top]);
--top;
}
outbuf -> sputc(ch);
}
inline void
putst(const char *st)
{
static std::streambuf *outbuf = cout.rdbuf();
do { outbuf->sputc(*(st ++));} while (*st);
}
template <typename T>
inline void
put(const char *st,T x)
{
static std::streambuf *outbuf = cout.rdbuf();
static char stack[21];
static int top = 0;
if (x < 0) {
outbuf -> sputc('-');
x=-x;
}
if (!x) {
outbuf -> sputc('0');
putst(st);
return;
}
while (x) {
stack[++top] = x % 10 + '0';
x /= 10;
}
while (top) {
outbuf -> sputc(stack[top]);
--top;
}
putst(st);
}
template<typename T,typename ...Args>
inline void
put(T a,Args ...args) {
put(a);put(args...);
}
template<typename T,typename ...Args>
inline void
put(const char ch,T a,Args ...args) {
put(ch,a);put(ch,args...);
}
template<typename T,typename ...Args>
inline void
put(const char *st,T a,Args ...args) {
put(st, a);put(st,args...);
}
}
using IN::redi;
using IN::redc;
using IN::redst;
using OUT::put_non;
using OUT::put;
using OUT::putc;
using OUT::putst;
}
```