c++ - Boost Variant: Is there magic in the binding order? -


I am reading everything I can get (my headache). Some people were surprised that a string To save was saved as a hair. If I've listed the bool (after?) Before char * then a string will be saved as a char * string literally? What is the order between v1 and v2 ? 

  boost :: variant & lt; Char *, bool & gt; V1 = "Hello"; Promotion: version & lt; Bool, char * & gt; V2 = "Hello";

For integer, should I just tie the biggest integer for all integers or individually int8_t thru int64_t Should bind? If I have bound all of them, then fit into any of these, which has been saved as the first (last)?

How to float versus double ?

There is no magic.

Constructor's document behavior.

Template & lt; Typename T & gt;

Required : Any one of the rotating types (i.e., T1, T2, etc.) must be non-essentially convertible.

Postcondition : The content limit is one of the best conversions for operand for one of the limited dimensions, as determined by the standard surcharge resolution rules.

throws : With any exception arising from the conversion of operand, it may fail.

boost / variant.hpp> Int main () {{boost :: variant & lt; Bool, std :: string & gt; V; V = "Hello"; // Four Conte (& amp;) [6] converts to Bull (0 == v.which ()); V = static_cast & lt; Char const *> ("Hello"); Insert (0 == V. Joe ()); } // compare {boost :: variant & lt; Bool, char const *> V; V = "Hello"; // four consists (& amp;) [6] emphasize (1 == v.which ()); // Now match directly v = static_cast & lt; Char const *> ("Hello"); Emphasize (1 = V. he ()); }}

Comments

Post a Comment

Popular posts from this blog

python - Overriding the save method in Django ModelForm -

I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
Read more

html - CSS autoheight, but fit content to height of div -

I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
Read more

qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
Read more