分享自定义静态断言代码

本文代码来自于QQ群中nous大神，类似于static assert，不过断言异常内容可以自定义。

代码分为boost版本和标准版本，使用ENSURE_HAS_BOOST 宏来区分。

代码：

C++

//
// ensure.hpp
//
// Copyright (c) Nous Xiong.
//
// Macro ENSURE impl.
//
#ifndef ENSURE_HPP
#define ENSURE_HPP
#ifdef ENSURE_HAS_BOOST
#include <boost/exception/all>
#include <boost/thread/tss.hpp>
#include <boost/preprocessor/seq/for_each.hpp>
#include <boost/integer.hpp>
#include <stdexcept>
#include <sstream>
#include <iostream>
namespace un
{
/// 运行时刻信息
typedef boost::error_info<struct tag_runtime, std::string> errinfo_runtime_t;
/// 专用于ensure的异常信息
typedef boost::error_info<struct tag_ensure, std::string> errinfo_ensure_t;
/// 异常基类
class exception
: public virtual std::exception
, public virtual boost::exception
{
};
class ensure
{
public:
ensure()
: current_function_(0)
, file_(0)
, line_(-1)
, msg_(0)
{
}
~ensure()
{
}
public:
ensure& set_context(char const* expr, char const* current_function, char const* file, int line)
{
msg_ = 0;
err_.str("");
err_ << "Ensure failed, expression: '" << expr << "', values: ";
current_function_ = current_function;
file_ = file;
line_ = line;
// 这里你可以将std::cerr替换为你自己项目的日志系统
std::cerr <<
"Ensure failed point: [" << file_ << "]=[" << line_ << "]" << std::endl;
return *this;
}
ensure& set_current_val(boost::int8_t src, char const* name)
{
boost::int32_t tmp = (boost::int32_t)src;
return set_val(tmp, name);
}
ensure& set_current_val(bool src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::int16_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::uint16_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::int32_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::uint32_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::int64_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(boost::uint64_t src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(std::string const& src, char const* name)
{
err_ << name << " = " << src << ", size: " << src.size() << "; ";
return *this;
}
// 你可以加入任何你项目需要的数据类型
// 例如：
//ensure& set_current_val(my_data const& src, char const* name)
//{
// err_ << name << " = " << src.get_xxx() << "; ";
// return *this;
//}
/// 用户可添加的消息
ensure& set_current_val(char const* msg, char const*)
{
msg_ = msg;
return *this;
}
/// 抛出异常
template <typename ExceptT>
ensure& set_current_val(ExceptT const& ex, char const*)
{
if (msg_)
{
ex << errinfo_runtime_t(msg_);
}
ex << errinfo_ensure_t(err_.str());
boost::exception_detail::throw_exception_(ex, current_function_, file_, line_);
return *this;
}
static ensure& get_ensure()
{
// 为了多线程下方便的使用ensure，这里使用了线程本地存储，
// 如果是单线程程序，这里可以直接换为static ensure e;
static boost::thread_specific_ptr<ensure> this_ens;
ensure* ret = this_ens.get();
if (!ret)
{
this_ens.reset(new ensure);
ret = this_ens.get();
}
return *ret;
}
private:
template <typename T>
ensure& set_val(T const t, char const* name)
{
err_ << name << " = " << t << "; ";
return *this;
}
private:
std::stringstream err_;
char const* current_function_;
char const* file_;
int line_;
char const* msg_;
};
}
#define ENSURE_OP_IMPL(e, elem) e.set_current_val((elem), #elem); // 必须要定义这个宏，不然#elem无法正确的显示变量的字符串形式
#define ENSURE_OP(COLA_ENS, e, elem) ENSURE_OP_IMPL(e, elem)
#define ENSURE(expr, args) \
if( (expr) ) ; \
else \
{ \
un::ensure& e = un::ensure::get_ensure(); \
e.set_context(#expr, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__); \
BOOST_PP_SEQ_FOR_EACH(ENSURE_OP, e, args); \
}
#else
#include <stdexcept>
#include <sstream>
#include <iostream>
namespace un
{
class ensure
{
public:
ensure()
: ENSURE_A(*this)
, ENSURE_B(*this)
, file_(0)
, line_(-1)
, msg_(0)
{
}
~ensure()
{
}
ensure& ENSURE_A;
ensure& ENSURE_B;
public:
ensure& set_context(char const* expr, char const* file, int line)
{
msg_ = 0;
err_.str("");
err_ << "Ensure failed, expression: '" << expr << "', values: ";
file_ = file;
line_ = line;
// 这里你可以将std::cerr替换为你自己项目的日志系统
std::cerr <<
"Ensure failed point: [" << file_ << "]=[" << line_ << "]" << std::endl;
return *this;
}
ensure& set_current_val(char src, char const* name)
{
int tmp = (int)src;
return set_val(tmp, name);
}
ensure& set_current_val(bool src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(short src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(int src, char const* name)
{
return set_val(src, name);
}
ensure& set_current_val(std::string const& src, char const* name)
{
err_ << name << " = " << src << ", size: " << src.size() << "; ";
return *this;
}
// 你可以加入任何你项目需要的数据类型
// 例如：
//ensure& set_current_val(my_data const& src, char const* name)
//{
// err_ << name << " = " << src.get_xxx() << "; ";
// return *this;
//}
/// 用户可添加的消息
ensure& set_current_val(char const* msg, char const*)
{
msg_ = msg;
return *this;
}
/// 抛出异常
template <typename ExceptT>
ensure& set_current_val(ExceptT const& ex, char const*)
{
if (msg_)
{
err_ << "user msg = " << msg_;
}
ex.set_error(err_.str()); // 需要用户实现这个方法
throw ex;
return *this;
}
static ensure& get_ensure()
{
// 仅仅单线程
static ensure ret;
return ret;
}
private:
template <typename T>
ensure& set_val(T const t, char const* name)
{
err_ << name << " = " << t << "; ";
return *this;
}
private:
std::stringstream err_;
char const* file_;
int line_;
char const* msg_;
};
}
#define ENSURE_A(x) ENSURE_OP(x, B)
#define ENSURE_B(x) ENSURE_OP(x, A)
#define ENSURE_OP(x, next) \
ENSURE_A.set_current_val((x), #x).ENSURE_##next
#define ENSURE(expr) \
if( (expr) ) ; \
else un::ensure::get_ensure().set_context(#expr,__FILE__,__LINE__).ENSURE_A
#endif
#endif /* COLA_ENSURE_HPP */

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// // ensure.hpp // // Copyright (c) Nous Xiong. // // Macro ENSURE impl. //   #ifndef ENSURE_HPP #define ENSURE_HPP   #ifdef ENSURE_HAS_BOOST   #include <boost/exception/all> #include <boost/thread/tss.hpp> #include <boost/preprocessor/seq/for_each.hpp> #include <boost/integer.hpp> #include <stdexcept> #include <sstream> #include <iostream>   namespace un { /// 运行时刻信息 typedef boost::error_info<struct tag_runtime, std::string> errinfo_runtime_t;   /// 专用于ensure的异常信息 typedef boost::error_info<struct tag_ensure, std::string> errinfo_ensure_t;   /// 异常基类 class exception   : public virtual std::exception   , public virtual boost::exception { };   class ensure { public:   ensure()     : current_function_(0)     , file_(0)     , line_(-1)     , msg_(0)   {   }     ~ensure()   {   }   public:   ensure& set_context(char const* expr, char const* current_function, char const* file, int line)   {     msg_ = 0;     err_.str("");     err_ << "Ensure failed, expression: '" << expr << "', values: ";     current_function_ = current_function;     file_ = file;     line_ = line;       // 这里你可以将std::cerr替换为你自己项目的日志系统     std::cerr <<       "Ensure failed point: [" << file_ << "]=[" << line_ << "]" << std::endl;     return *this;   }     ensure& set_current_val(boost::int8_t src, char const* name)   {     boost::int32_t tmp = (boost::int32_t)src;     return set_val(tmp, name);   }   ensure& set_current_val(bool src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::int16_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::uint16_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::int32_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::uint32_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::int64_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(boost::uint64_t src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(std::string const& src, char const* name)   {     err_ << name << " = " << src << ", size: " << src.size() << "; ";     return *this;   }   // 你可以加入任何你项目需要的数据类型   // 例如：   //ensure& set_current_val(my_data const& src, char const* name)   //{   //  err_ << name << " = " << src.get_xxx() << "; ";   //  return *this;   //}     /// 用户可添加的消息   ensure& set_current_val(char const* msg, char const*)   {     msg_ = msg;     return *this;   }     /// 抛出异常   template <typename ExceptT>   ensure& set_current_val(ExceptT const& ex, char const*)   {     if (msg_)     {       ex << errinfo_runtime_t(msg_);     }     ex << errinfo_ensure_t(err_.str());     boost::exception_detail::throw_exception_(ex, current_function_, file_, line_);     return *this;   }     static ensure& get_ensure()   {     // 为了多线程下方便的使用ensure，这里使用了线程本地存储，     // 如果是单线程程序，这里可以直接换为static ensure e;     static boost::thread_specific_ptr<ensure> this_ens;     ensure* ret = this_ens.get();     if (!ret)     {       this_ens.reset(new ensure);       ret = this_ens.get();     }     return *ret;   }   private:   template <typename T>   ensure& set_val(T const t, char const* name)   {     err_ << name << " = " << t << "; ";     return *this;   }   private:   std::stringstream err_;   char const* current_function_;   char const* file_;   int line_;   char const* msg_; }; }   #define ENSURE_OP_IMPL(e, elem) e.set_current_val((elem), #elem); // 必须要定义这个宏，不然#elem无法正确的显示变量的字符串形式 #define ENSURE_OP(COLA_ENS, e, elem) ENSURE_OP_IMPL(e, elem)   #define ENSURE(expr, args) \   if( (expr) ) ; \   else \   { \     un::ensure& e = un::ensure::get_ensure(); \     e.set_context(#expr, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__); \     BOOST_PP_SEQ_FOR_EACH(ENSURE_OP, e, args); \   }   #else   #include <stdexcept> #include <sstream> #include <iostream>   namespace un { class ensure { public:   ensure()     : ENSURE_A(*this)     , ENSURE_B(*this)     , file_(0)     , line_(-1)     , msg_(0)   {   }     ~ensure()   {   }     ensure& ENSURE_A;   ensure& ENSURE_B;   public:   ensure& set_context(char const* expr, char const* file, int line)   {     msg_ = 0;     err_.str("");     err_ << "Ensure failed, expression: '" << expr << "', values: ";     file_ = file;     line_ = line;       // 这里你可以将std::cerr替换为你自己项目的日志系统     std::cerr <<       "Ensure failed point: [" << file_ << "]=[" << line_ << "]" << std::endl;     return *this;   }     ensure& set_current_val(char src, char const* name)   {     int tmp = (int)src;     return set_val(tmp, name);   }   ensure& set_current_val(bool src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(short src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(int src, char const* name)   {     return set_val(src, name);   }   ensure& set_current_val(std::string const& src, char const* name)   {     err_ << name << " = " << src << ", size: " << src.size() << "; ";     return *this;   }   // 你可以加入任何你项目需要的数据类型   // 例如：   //ensure& set_current_val(my_data const& src, char const* name)   //{   //  err_ << name << " = " << src.get_xxx() << "; ";   //  return *this;   //}     /// 用户可添加的消息   ensure& set_current_val(char const* msg, char const*)   {     msg_ = msg;     return *this;   }     /// 抛出异常   template <typename ExceptT>   ensure& set_current_val(ExceptT const& ex, char const*)   {     if (msg_)     {       err_ << "user msg = " << msg_;     }     ex.set_error(err_.str()); // 需要用户实现这个方法     throw ex;     return *this;   }     static ensure& get_ensure()   {     // 仅仅单线程     static ensure ret;     return ret;   }   private:   template <typename T>   ensure& set_val(T const t, char const* name)   {     err_ << name << " = " << t << "; ";     return *this;   }   private:   std::stringstream err_;   char const* file_;   int line_;   char const* msg_; }; }   #define ENSURE_A(x) ENSURE_OP(x, B) #define ENSURE_B(x) ENSURE_OP(x, A)   #define ENSURE_OP(x, next) \   ENSURE_A.set_current_val((x), #x).ENSURE_##next   #define ENSURE(expr) \   if( (expr) ) ; \   else un::ensure::get_ensure().set_context(#expr,__FILE__,__LINE__).ENSURE_A   #endif   #endif /* COLA_ENSURE_HPP */

测试代码：

C++

// ensure.cpp : Defines the entry point for the console application.
//
#include "ensure.hpp"
#ifdef ENSURE_HAS_BOOST
class my_except : public virtual un::exception {};
int main(int argc, char *argv[])
{
try
{
boost::int32_t i = 0;
std::string str("test str");
ENSURE(i == 0 && str.empty(), (i)(str)("Test Ensure Msg")(my_except()));
std::cout << "Shouldn't be here." << std::endl;
}
catch (my_except& ex)
{
std::cerr << boost::diagnostic_information(ex) << std::endl;
}
return 0;
}
#else
class my_except : public virtual std::exception
{
public:
void set_error(std::string const& err) const
{
err_ = err;
}
virtual char const* what() const throw()
{
return err_.c_str();
}
private:
mutable std::string err_;
};
int main(int argc, char *argv[])
{
try
{
int i = 0;
std::string str("test str");
ENSURE(i == 0 && str.empty())(i)(str)("Test Ensure Msg")(my_except());
std::cout << "Shouldn't be here." << std::endl;
}
catch (my_except& ex)
{
std::cerr << ex.what() << std::endl;
}
system("pause");
return 0;
}
#endif

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// ensure.cpp : Defines the entry point for the console application. // #include "ensure.hpp"   #ifdef ENSURE_HAS_BOOST   class my_except : public virtual un::exception {};   int main(int argc, char *argv[]) {   try   {     boost::int32_t i = 0;     std::string str("test str");     ENSURE(i == 0 && str.empty(), (i)(str)("Test Ensure Msg")(my_except()));     std::cout << "Shouldn't be here." << std::endl;   }   catch (my_except& ex)   {     std::cerr << boost::diagnostic_information(ex) << std::endl;   }       return 0; }   #else   class my_except : public virtual std::exception { public:   void set_error(std::string const& err) const   {     err_ = err;   }     virtual char const* what() const throw()   {     return err_.c_str();   }   private:   mutable std::string err_; };   int main(int argc, char *argv[]) {   try   {     int i = 0;     std::string str("test str");     ENSURE(i == 0 && str.empty())(i)(str)("Test Ensure Msg")(my_except());     std::cout << "Shouldn't be here." << std::endl;   }   catch (my_except& ex)   {     std::cerr << ex.what() << std::endl;   }     system("pause");   return 0; }   #endif

ensure下载地址：

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