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csting中更新接口,看不懂

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看不懂using::std是啥意思

NDK

发布于 2023-05-03 23:29

528浏览


如同
新版本成了这样



// -*- C++ -*-
//===--------------------------- cstring ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CSTRING
#define _LIBCPP_CSTRING

/*
    cstring synopsis

Macros:

    NULL

namespace std
{

Types:

    size_t

void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
void* memmove(void* s1, const void* s2, size_t n);
char* strcpy (char* restrict s1, const char* restrict s2);
char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
char* strcat (char* restrict s1, const char* restrict s2);
char* strncat(char* restrict s1, const char* restrict s2, size_t n);
int memcmp(const void* s1, const void* s2, size_t n);
int strcmp (const char* s1, const char* s2);
int strncmp(const char* s1, const char* s2, size_t n);
int strcoll(const char* s1, const char* s2);
size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
const void* memchr(const void* s, int c, size_t n);
      void* memchr(      void* s, int c, size_t n);
const char* strchr(const char* s, int c);
      char* strchr(      char* s, int c);
size_t strcspn(const char* s1, const char* s2);
const char* strpbrk(const char* s1, const char* s2);
      char* strpbrk(      char* s1, const char* s2);
const char* strrchr(const char* s, int c);
      char* strrchr(      char* s, int c);
size_t strspn(const char* s1, const char* s2);
const char* strstr(const char* s1, const char* s2);
      char* strstr(      char* s1, const char* s2);
char* strtok(char* restrict s1, const char* restrict s2);
void* memset(void* s, int c, size_t n);
char* strerror(int errnum);
size_t strlen(const char* s);

}  // std

*/

#include <__config>
#include <string.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

using ::size_t;
using ::memcpy;
using ::memmove;
using ::strcpy;
using ::strncpy;
using ::strcat;
using ::strncat;
using ::memcmp;
using ::strcmp;
using ::strncmp;
using ::strcoll;
using ::strxfrm;
using ::memchr;
using ::strchr;
using ::strcspn;
using ::strpbrk;
using ::strrchr;
using ::strspn;
using ::strstr;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::strtok;
#endif
using ::memset;
using ::strerror;
using ::strlen;

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_CSTRING

如同
新版本成了这样

// -- C++ --
//=--------------------------- cstring ----------------------------------=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//=----------------------------------------------------------------------=//

#ifndef _LIBCPP_CSTRING
#define _LIBCPP_CSTRING

/*
cstring synopsis

Macros:

NULL

namespace std
{

Types:

size_t

void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
void* memmove(void* s1, const void* s2, size_t n);
char* strcpy (char* restrict s1, const char* restrict s2);
char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
char* strcat (char* restrict s1, const char* restrict s2);
char* strncat(char* restrict s1, const char* restrict s2, size_t n);
int memcmp(const void* s1, const void* s2, size_t n);
int strcmp (const char* s1, const char* s2);
int strncmp(const char* s1, const char* s2, size_t n);
int strcoll(const char* s1, const char* s2);
size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
const void* memchr(const void* s, int c, size_t n);
void* memchr( void* s, int c, size_t n);
const char* strchr(const char* s, int c);
char* strchr( char* s, int c);
size_t strcspn(const char* s1, const char* s2);
const char* strpbrk(const char* s1, const char* s2);
char* strpbrk( char* s1, const char* s2);
const char* strrchr(const char* s, int c);
char* strrchr( char* s, int c);
size_t strspn(const char* s1, const char* s2);
const char* strstr(const char* s1, const char* s2);
char* strstr( char* s1, const char* s2);
char* strtok(char* restrict s1, const char* restrict s2);
void* memset(void* s, int c, size_t n);
char* strerror(int errnum);
size_t strlen(const char* s);

} // std

#include <__config>
#include <string.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

using ::size_t;
using ::memcpy;
using ::memmove;
using ::strcpy;
using ::strncpy;
using ::strcat;
using ::strncat;
using ::memcmp;
using ::strcmp;
using ::strncmp;
using ::strcoll;
using ::strxfrm;
using ::memchr;
using ::strchr;
using ::strcspn;
using ::strpbrk;
using ::strrchr;
using ::strspn;
using ::strstr;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::strtok;
#endif
using ::memset;
using ::strerror;
using ::strlen;

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_CSTRING

如同 新版本成了这样 // -- C++ -- //=--------------------------- cstring ----------------------------------=// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //=----------------------------------------------------------------------=// #ifndef _LIBCPP_CSTRING #define _LIBCPP_CSTRING /* cstring synopsis Macros: <pre><code>NULL </code></pre> namespace std { Types: <pre><code>size_t </code></pre> void* memcpy(void* restrict s1, const void* restrict s2, size_t n); void* memmove(void* s1, const void* s2, size_t n); char* strcpy (char* restrict s1, const char* restrict s2); char* strncpy(char* restrict s1, const char* restrict s2, size_t n); char* strcat (char* restrict s1, const char* restrict s2); char* strncat(char* restrict s1, const char* restrict s2, size_t n); int memcmp(const void* s1, const void* s2, size_t n); int strcmp (const char* s1, const char* s2); int strncmp(const char* s1, const char* s2, size_t n); int strcoll(const char* s1, const char* s2); size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n); const void* memchr(const void* s, int c, size_t n); void* memchr( void* s, int c, size_t n); const char* strchr(const char* s, int c); char* strchr( char* s, int c); size_t strcspn(const char* s1, const char* s2); const char* strpbrk(const char* s1, const char* s2); char* strpbrk( char* s1, const char* s2); const char* strrchr(const char* s, int c); char* strrchr( char* s, int c); size_t strspn(const char* s1, const char* s2); const char* strstr(const char* s1, const char* s2); char* strstr( char* s1, const char* s2); char* strtok(char* restrict s1, const char* restrict s2); void* memset(void* s, int c, size_t n); char* strerror(int errnum); size_t strlen(const char* s); } // std */ #include <__config> #include <string.h> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) #pragma GCC system_header #endif _LIBCPP_BEGIN_NAMESPACE_STD using ::size_t; using ::memcpy; using ::memmove; using ::strcpy; using ::strncpy; using ::strcat; using ::strncat; using ::memcmp; using ::strcmp; using ::strncmp; using ::strcoll; using ::strxfrm; using ::memchr; using ::strchr; using ::strcspn; using ::strpbrk; using ::strrchr; using ::strspn; using ::strstr; #ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS using ::strtok; #endif using ::memset; using ::strerror; using ::strlen; _LIBCPP_END_NAMESPACE_STD #endif // _LIBCPP_CSTRING

如同
新版本成了这样

#ifndef _LIBCPP_CSTRING
#define _LIBCPP_CSTRING

/*
cstring synopsis

Macros:

NULL

namespace std
{

Types:

size_t

} // std

#include <__config>
#include <string.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_CSTRING

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宋炯乐作者

2023-05-04 14:16


问题中描述的是cstring文件
点击查看后发现string文件已经提供了对应的方法,不知道第二期时derry老师为什么用cstring中的方法

问题中描述的是cstring文件
点击查看后发现string文件已经提供了对应的方法,不知道第二期时derry老师为什么用cstring中的方法

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