Console

Module: Core API

Defines C++ wrapper to log/print text messages. More...

Classes

	Name
class	eosio::iostream

Functions

	Name
void	printhex(const void * ptr, uint32_t size)
void	printl(const char * ptr, size_t len)
void	print(const char * ptr)
void	print(float num)
void	print(double num)
void	print(long double num)
template <typename T ,std::enable_if_t<!std::is_integral< std::decay_t< T >>::value, int > =0> void	print(T && t)
void	print_f(const char * s)

Detailed Description

Defines C++ wrapper to log/print text messages.

This API uses C++ variadic templates and type detection to make it easy to print any native type. You can even overload the [print()](/cdt/latest/reference/Modules/group__console#function-print) method for your own custom types.

Example:

print( "hello world, this is a number: ", 5 );

Overriding Print for your Types

There are two ways to overload print:

1. implement void print( const T& )
2. implement T::print()const

Functions Documentation

function printhex

inline void printhex(
    const void * ptr,
    uint32_t size
)

Parameters:

• ptr - pointer to bytes of interest
• size - number of bytes to print

Prints a block of bytes in hexadecimal

function printl

inline void printl(
    const char * ptr,
    size_t len
)

Parameters:

• ptr - a string
• len - number of chars to print

Prints string to a given length

function print

inline void print(
    const char * ptr
)

Parameters:

• ptr - a null terminated string

Prints string

function print

inline void print(
    float num
)

Parameters:

• num to be printed

Prints single-precision floating point number (i.e. float)

function print

inline void print(
    double num
)

Parameters:

• num to be printed

Prints double-precision floating point number (i.e. double)

function print

inline void print(
    long double num
)

Parameters:

• num to be printed

Prints quadruple-precision floating point number (i.e. long double)

function print

template <typename T ,
std::enable_if_t<!std::is_integral< std::decay_t< T >>::value, int >  =0>
inline void print(
    T && t
)

Parameters:

• t to be printed

Precondition: T must implements print() function

Prints class object

function print_f

inline void print_f(
    const char * s
)

Parameters:

• s null terminated string to be printed

Prints null terminated string

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Updated on 2022-12-05 at 15:38:08 +0000