C++ error: decomposition declaration not permitted in this context [closed] - c++

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Why is g++ giving an error like this?
blahblah.h:80:10: error: decomposition declaration not permitted in this context
float[NUM_OUTPUTS] output_buffer;
(Already solved, but creating this because there's no good google hits for this error text, and the error message is inscrutable.)

In C++ declarations, the array size goes after the variable name, not after the type:
float output_buffer[NUM_OUTPUTS];

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What does ch!=?.? mean in c++ [closed]

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Closed 1 year ago.
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This is used here do {....} while(ch!=?.?); what does ch!=?.? mean here can anybody please help with it.
It's a syntax error with both clang and gcc.
#JonathanLeffler is usually right and I think he nailed the root cause. I used to see this when text was being copied from Microsoft Word to the web (lack of transcode from a Windows code page to ascii/utf8?).

What is the use function in c++? [closed]

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I'm currently reading a c++ book and one of the function is
void fp(char v[]){
for(char* p = v; *p!=0;p++) use(*p);
}
I wrote this into my editor and compiled it. I also included the headers
#include <iostream>
#include <string.h>
But my terminal returns the following message:
use of undeclared identifier 'use'
I also google it and its nowhere to be found online, the function doesn't exist.
That's because there is no such standard library function.
The author is either using pseudo-code here, or has defined this function somewhere else in the book.

Variable not declared in the scope error [closed]

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Why am I getting this problem and how can I fix it? From my point of view I already declared it. Please see the image.
Thanks a lot!
You have an extra semicolon between the for statement and opening brace. That makes the for loop have an empty body, and the braced expressions have no idea what angle is supposed to be, since it truly is out-of-scope.

do_trucate in jinja2, correct usage needed [closed]

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Closed 7 years ago.
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I think I saw something on using this to truncate test as a filter, but I've seen to no idea how to use it. Using as xx|do_trucate(20) gives the following:
TemplateAssertionError: no filter named 'do_truncate'
What is the correct usage?
Doh, from the spec I saw
do_trucate
http://code.nabla.net/doc/jinja2/api/jinja2/jinja2.filters.html
But in reality, its just truncate

Creating vector of vector of complex numbers [closed]

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Closed 8 years ago.
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I'm attempting to create a vector of vectors of complex numbers, however it will not work, previous research indicates that the following should work
vector <vector <complex<double> > test(1,vector<complex<double> >(3));
it does not
I can't figure out why and I am going crazy trying to figure out why, I get the following error
error: template argument 1 is invalid
Can anyone figure out why?
You are missing one >:
vector<vector<complex<double> > > test(1, vector<complex<double> >(3));
// ^