o2logger

logger in string-format style

Introduction

Base concept - is a mix between printf and std::streams.

Rationale

Usage of printf:
[+] convenient for writing
[-] it is necessary to specify types of variable
[-] it is impossible to print complex type
Example:

printf("easy to combain %s with data: %d\n", "what i want", 42);

Usage of streams:
[+] no need to specify types
[+] it is possible to print complex type
[-] awkward syntax
Example:

std::cerr << "all these " << "brackets " << "make " << "my cry " << 42 << std::endl;

Usage of o2logger

#include "o2logger.hpp"
using namespace o2logger;

o2logger::Logger::impl().setOptionLogLevel(0);             // [0-5], by default it is 0
o2logger::Logger::impl().setOptionSyslog("myprog", true);  // write into syslog, default false

So, o2logger at least:

• can set loglevel
• can write into syslog or stdout

Severety

logi - [i] - info
logw - [w] - warning
loge - [e] - error
logd - [d] - debug 
logd1, logd2, logd3, logd4, logd5      // if LogLevel == 2, then logd3() won't write, but logd2() will

Example of o2logger usage

// simple string
logi("Hello world!");                     // [i] Hello world!
logw("World is in a danger!");            // [w] World is in a danger!
loge("Oh no, it is cruel world :(");      // [e] Oh no, it is cruel world :(

// simple list of args
logi("key value: ", 1);                   // [i] key value: 1
loge(3.14, " key value:");                // [e] 3.14 key value:
logw("key value: ", "abc");               // [w] key value: abc
logd("Debug1: ", 1, ", Debug2: ", 2);     // [d] Debug1: 1, Debug2: 2

// formatted print
f::logi("key value: {0}, {1}", 1, 2);     // [i] key value: 1, 2
f::logw("key value: {1}, {0}", 1, 2);     // [w] key value: 2, 1
f::loge("key {0} value {1}", 3.14, 'x');  // [e] key 3.14 value x
f::loge("key {0} value {2}", 3.14, 'x');  // [e] key 3.14 value nil

TODO: for struct

Authors

• Victor Mogilin ([email protected])